Archives for September 2017

Arrived in Casamance

In our previous update Blue DF was flying south through northern Senegal, and we wondered how far south he would continue. Would he winter somewhere in Senegal or The Gambia, or continue further south into Guinea-Bissau? As an experienced adult osprey – Blue DF is seven years old – he will have an established wintering site in West Africa, and the latest batch of data suggests that his is likely a creek on the north side of the Casamance River in southern Senegal. Having arrived there on Tuesday afternoon he has made only local movements since, suggesting that he has reached his winter home.

The previous data had shown that Blue DF roosted near Louga in northern Senegal on Sunday evening (24th September). He resumed his migration at approximately 10:15 next morning and made fairly leisurely progress south, passing over Touba at 14:50 at an altitude of 404 m having flown 86 km. He continued on a southerly heading until 17:48 when he stopped just to the north of the town of Guinguineo after a day’s flight of 157 km.

Blue DF was perchded beside the Saloum River near Kaolack for two hours on Tuesday morning, presumably eating a fish

Next morning he almost certainly fished in the Saloum River a few kilometres east of Kaolack because he was perched beside the river for almost two hours from 08:13, presumably eating his catch. He resumed his migration at around 10:00 and by 12:44 he had flown 77 km and was crossing the River Gambia at Tendaba at an altitude of 478 m.

Blue DF crossed the River Gambia at Tendaba, a famous birding destination

Having crossed the river he made a distinct turn to the south-west. He crossed back in Senegal at 14:15 and at 15:32 he was flying over a series of creeks on the north side of the Casamance River. By 18:24 he had continued south and was over the north shore of the main river, but he then double-backed and settled to roost for the night in a forested area beside a creek 15 km north of the town of Ziguinchor after a day’s flight of  261 km.

Blue DF roosted in a wooded area on the north side of the Casamance River on Tuesday evening

At dawn on Wednesday morning Blue DF flew 15 km north, back to the creek near the village of Diegoun. Later in the morning he set-off on a 61 km, 5 hour circuit of the north side of the creek, perhaps checking out which other ospreys had returned. By 15:51 he was back in the creek near Diegoum before morving 8 km north to roost in another part of the creek near Baila.

Yesterday Blue DF made shorter local movements around the creek and at 18:44 was perched on the mud 2.5 km from Baila, where he settled to roost for the night. It certainly seems likely that he has reached his winter home.

Blue DF has made two long exploratory flights since arriving in Casamance on Tuesday afternoon

Blue DF made only short local movments yesterday and has roosted in the creek near the village of Baila for the past two nights (roost sites 5 km apart)

Assuming that Blue DF has now arrived at his wintering site his migration from Scotland took a total of 19 days, during which period he covered a total of 5494 km. He covered an average of 268 km per day through Europe, and 313 km per day in Africa. You can check out Blue DF’s complete migration on our interactive map. 

The final leg of Blue DF’s migration to the Casamance region of southern Senegal

Blue DF flew 5494 km from Scotland to Senegal in 19 days

Blue JV3 still in Brittany

While Blue DF flies south through Senegal, Blue JV3 is continuing to stop over near the Gulf of Morbihan on the Brittany coast. Blue JV3 refers to the bird’s colour ring on his left leg, but those of you who follow our Facebook page  will know that we asked for suggestions for a name for Blue JV3 to use in our updates. We very much enjoyed reading all your suggestions but in the end by far the most popular name was ‘Jules’ after the French novelist Jules Verne (i.e. JV), most famous for his adventure novels including Around the World in Eighty Days.  It seems fitting therefore that Blue JV3, or Jules as we will now refer to him, is stopping-over in France. Thanks to Janine Pannett for the great suggestion.

Having arrived on Saturday 16th September Jules has spent most of his time in a 40 km² area stretching from the west end of Gulf of Morbihan north to a short section of the River Auray, north of the town of Auray, and then across to his favoured roosting area in the forested banks of the River Bono north of Plougoumelen.

Blue JV3 has tended to favour two areas to the north-west of Gulf of Morbihan since arriving on 16th September. The red shaded areas include 50% of GPS fixes since he arrived

Blue JV3 often roosts beside the River Bono

In recent days Blue JV3 has spent most afternoons beside the River Auray

It will be interesting to see how long Jules remains at Gulf of Morbihan. Another of our satellite tagged birds, Nimrod, stopped-over on Ile d’Oleron, a small island situated just to the south of La Rochelle in autumn 2008, 2009 and 2010. In each year he favoured the same forested area in the south of the island and fished along the coast once or twice a day. In 2010 he spent a total of nineteen days on the island, thereby constituting almost half of the total days (40) it took to migrate to its wintering site in Guinea-Bissau. Don’t forget that you can check out all of Jules’ recent movements on our interactive map.

Blue DF reaches Senegal

He’s made it. Last night Blue DF roosted 40 km to the east of Louga in northern Sengeal having completed his crossing of the Sahara in four days.

On Thursday night last week (21 September) Blue DF has roosted close to the Morocco-Western Sahara border in the Sahara and he left his roost at 09:20. Conditions were obviously perfect for migration because four hours after leaving his overnight roost he had already flown 197 km and crossed into Mauritania. He continued to make excellent progress during the afternoon, flying at altitudes of up to 1174 m, and by the time he stopped to roost at 18:49 he had flown 503 km on a constant south-westerly heading.

Blue DF’s was flying through Western Sahara on 21st September

Next morning Blue DF left his overnight roost in the desert fairly early, at 08:25. Like the previous day, conditions must have been in his favour because he made good progress, passing to the east of the vast Fderik iron ore mine at 11:02 and then onwards through the Akchar desert at altitudes of up to 1170 m. He continued flying until 19:20 when he finally settled to roost among sparse vegetation having flown a further 432 km through the desert.

Blue DF passed the vast Fderik iron ore mine on Friday morning (22nd Sept)

On Saturday morning Blue DF left his overnight roost just before 9:30, again on on a south-westerly heading. He made slower progress than the previous two days and by 14:11, when he was migrating at an altitude of 1500 m, he had flown 124 km. He eventually settled to roost for the evening at 18:30 having flown 252 km during the course of the day and was now just 80 km east of the Mauritanian capital, Nouakchott and nearing the end of his desert crossing.

Blue DF’s roost in the Sahara on Saturday evening

Blue DF must have sensed that he was close to completing his crossing of the Sahara because he left his roost early at 08:16. He appeared to be heading towards the coast, but at 10:22 he turned to a southerly heading for the next four hours, crossing the Senegal River at Richard Toll at 14:15 – his first sight of water for at least four days – before continuing south along the east shore of Lac de Guiers during the course of the afternoon. By 16:29 he was at the southern end of the vast lake, but it seems that he did not stop to catch a fish, and instead continued another 34 km south-west before settling to roost 20 km east of Louga in the arid north of Senegal.

Blue DF crossed the Senegal River on Sunday and then continued south along the east shore of Lac de Guiers

With the desert crossing behind him it will be fascinating to see where Blue DF migrates to. As an adult osprey he will have a regular wintering site in West Africa, but the question is where? On his current course he may be heading for the Sine-Saloum delta in Senegal, or he could head further south to The Gambia, the Casamance region of southern Senegal, or perhaps, Guinea-Bissau. Watch this space! In the meantime, you can check out his migration so far on our interactive map.

Blue DF flew 1500 km across the Sahara in four days between 21 and 24 September

Into the Sahara

After arriving in Africa on Sunday evening Blue DF has flown the length of Morocco over the past three days and at 11:09 this morning was heading south through Western Sahara.

The previous data had shown that at 11:13 on Monday morning Blue DF was at Barrage Oued El Makhazine in northern Morocco. It is possible he caught a fish because he was then perched 8 km to the south for almost an hour. Once he resumed his migration he made good progress on a  constant south-westerly heading at altitudes of up to 1350 m. At 19:41 local time he arrived at another reservoir, Barrage Al Massira having flown 307 km since 12:45. He arrived at sunset and so it is unlikely that he caught a fish; instead he settled to roost 9 km south-west of the reservoir after a day’s flight of 380 km.

Blue DF roosted to the south of Barrage Al Massira on Monday evening, with the Atlas Mountains in the distance

By dawn next morning Blue DF had moved location several times during the night and was 56 km further south-west. He continued to make stuttering progress during the morning and at 12:10 and 12:34 he was perched beside another reservoir, 60 km north-west of Marrakesh, perhaps eating a fish. By 12:59 he was migrating again and he flew strongly south-west during the course of the afternoon, pausing briefly at Barrage Prince Moulay Abdellah and then continuing onward towards Agadir. At 17:01 reached the coast and headed south-south-east for 60 km over the sea at altitudes of between 150 and 170 m, perhaps to avoid the city. He reached land again at 18:13 and eventually settled to roost half an hour later, 58 km south of Agadir after a day’s flight of 328 km.

Blue DF flew 60 km over the sea rather than keeping to the coast over Agadir

After a slow start on Wednesday morning, when he may have caught a fish in the Massa River, Blue DF set-off again soon after 11:00, passing just to the west of Tiznit at 12:00 and then out into the Sahara, flying over some spectacular landforms in the process. By 17:11 he had flown 197 km and was migrating at an altitude of 1179 m and approaching the spectacular ridge that runs for 350 south-west across the northern edge of the desert. Many ospreys follow this ridge on their migration by Blue DF crossed it and then maintained the same southerly heading for a further 67 km before settling to roost on the desert floor on the Morocco-Western Sahara border just before 19:00. He had covered a total of 264 km during his day’s flight.

Blue DF flew over some incredible landforms as he headed into the Sahara

By 09:32 (local time) this morning Blue DF had moved 3 km to the south-west and he resume his migration soon after 10:00. At 11:09 the last GPS fix in this batch of data he was 29 km further on migrating south-south-west at an altitude of 857 m, with the vast expanse of the Sahara ahead.

Blue DF crossed Morocco in three days and is now flying south through Western

Don’t forget that you can also check out Blue DF’s migration on our interactive map.

A Brittany break

After a fast start to his migration at the end of last week Blue JV3 spent much of yesterday at the Gulf of Morbihan on the Brittany coast and was still there at 12:57 local time today.

The previous batch of data had shown that Blue JV3 was just north of Leamington Spa at 08:45 on Saturday morning having left his overnight roost near Leeds soon after first light. Over the course of the next four hours he made fast progress south and at 12:52 was approaching Southampton at an altitude of 698 metres. An hour later he was high (854 m) over western Isle of Wight and he then made a two-an-a-half hour crossing of the English Channel, making landfall to the east of Cherbourg. Once in French airspace he changed his heading to south-west and flew direct across the sea to St-Malo. He eventually settled to roost for the night beside the Rance Estuary, just north of the village of Saint-Suliac at 22:01 local time having flown an impressive 584 km from South Yorkshire.

JV3 roosted beside the Rance Estuary in Brittany on Saturday night

On Sunday morning BLue JV3 had already left his overnight roost at 08:00 and was flying purposefully south-west. Four hours later at midday he was perched on the edge of a forested area to the east of the Gulf of Morbihan having flown 122 km. Interestingly he went no further and instead made only local movements during the course of the afternoon. At 17:18 he was perched in the estuary and was still there an hour later: suggesting he was eating a fish. He then headed off to roost in a wooded area 18 km north-west near the village of Leran.

This morning Blue JV3 flew back to the Gulf of Morbihan and appeared to be fishing at both 10:56 and 11:57, the latter being the last GPS fix in this latest batch of data. This vast natural habour would be an excellent place for a stop-over and it is possible that JV3 will linger here for a few days. His change of track through Brittany certainly indicates that he made a conscious decision to head there. Many ospreys have a favourite stop-over site that they visit on each migration; it seems very likely that this is a place Blue JV3 has visited before.

You can check out Blue JV3’s migration on our interactive map.

Blue JV3 has remained around Gulf of Morbihan since arriving there at lunchtime on Sunday

JV3’s migration 15-18 Sept

Blue DF is in Africa

After a relatively slow start to his migration Blue DF really increased his pace over the weekend, flying the length of Spain in just over two days and crossing the Strait of Gibraltar to Africa yesterday evening. The latest data shows that at 11:13 local time this morning he was at Barrage Oued El Makhazine in northern Morocco.

In our previous update on Friday evening Blue DF was flying south through northern Spain and we now know that he continued flying until around 20:30 loal time, when he was perched beside the Rio Duero having flown 315 km from north of Biarritz.

Blue DF spent Friday evening perched beside the Rio Duero, 130 km north-east of Madrid

On Saturday morning he left his roost site at 08:15 local time but then spent an hour-and-a-half perched another 8km further south. By 10:50 he had resumed his migration and was soon flying through mountains to the north of Madrid, climbing to over 2000 m in the process. He then skirted around the west side of the Spanish capital before continuing on a south-westerly course through eastern Extremadura towards the Sierra Morena mountains.  At 16:42 he was at an altitude of 2879 metres and would have had a good view south towards Embalse de Cijara. He was flying low over the reservoir half an hour later and then perched at the water’s edge for the next hour-an-a-half, presumably eating a fish. At 18:44 he was migrating again and he continued flying until after 20:00, covering another 71 km in the process. By the time he settled to roost in the Extremadura plains he had flown 364 km during the course of the day.

Blue DF skirted around the western side of Madrid on Saturday

The satellite data suggests Blue DF caught a fish at the EMbalse de Cijan in Extremadura on Saturday afternoon

On Sunday morning Blue DF made a fairly slow start to migration, finally leaving his overnight roost at 10:30. At 13:10 he had reached the northern edge of the Sierra Morena and he continued south across the mountains before pausing beside the Rio Guadalquivir for almost two hours during mid-afternoon; perhaps to eat a fish. By 17:11 he was heading south again and at 17:59 was passing to the east of Seville at an altitude of 850 m. Conditions must have been very good for migration because he showed no sign of letting up, continuing south through Andalucia. By 22:06 he was over Algeciras and, even though it was now an hour-and-a-half after sunset, he headed due south across the Strait of Gibraltar, making landfall near Eddalya at 22:55 Spanish time after a 17 km crossing.

At 22:06 on Sunday evening Blue DF set out across the Strait of Gibraltar in darkness towards Morocco

Despite reaching Moroccan airspace in the dark Blue DF continued flying for another 55 km before eventually settling to roost on a forested hillside after a day’s flight of 389 km.

This morning Blue DF had already left his overnight roosting site at 06:48 local time, but he then stopped again 11 km to the south. He resumed migration just before 10:00 and by 11:13 he was heading south over Barrage Oued El Makhazine reservoir having covered 64 km.

Blue DF’s flight 15-18 Sept

Don’t forget that you can check out Blue DF’s migration on our interactive map.

Blue DF reaches Spain

After a slow but steady flight through France, Blue DF has quickened his pace considerably in the last 48 hours and at 18:40 this evening he was flying south through the Castile and León region of north-east Spain.

In Wednesday’s update we reported that Blue DF was approaching the Atlantic coast of France, but the weather was clearly poor for migration because by 17:15 when he stopped at a series of small lakes near the village of Chevallon he had only flown 133 km during the course of the day, with several stops en route, perhaps during heavy rain showers. At 18:28 he was fishing in the lake, and then spent the rest of the evening perched in lakeside trees, presumably eating his catch. He eventually flew off to roost in a wooded area 1.5 km south.

Blue DF spent all of Wednesday afternoon beside a series of lake near the village of Chevallon in western France before roosting nearby.

Next morning he was back at the lakes at first light, and didn’t resume his migration until just before 11:00 local time. At 13:45 he flew low over the Girone estuary at an altitude of 72 m, before passing to the west of Bordeaux and then east of Arcachron Bay at a higher altitude of 450 m. At 18:10 he arrived at Etang de Soustons, a lake 35 km  north of Biarritz, and spent half and hour fishing in the lake. He then flew to a wooded area to the west and remained there for the rest of the evening having covered 239 km during his day’s flight.

Blue DF roosted in a wooded area to the west of Etang de Soustons in south-west France on Thursday night.

Blue DF was back at the lake at 09:44 and then spent an hour perched 3 km to the south, perhaps eating a fish. By 11:21 he was migrating again and over the course of the next few hours made good progress south, passing 13 km to the east of Biarritz at 13:23 and then crossing into Spanish airspace at an altitude of over 1105 m at 15:23. An hour later he passed over Pamplona and by 18:40, the last GPS fix in this batch, he had flown 237 km and was still heading powerfully south-west towards central Spain.

Blue DF was flying south through northern Spain this evening.

Don’t forget that you can also check out Blue DF’s migration on our interactive map.

Blue JV3 races south

On Wednesday evening this week Roy Dennis and Frank Law caught and satellite tagged another adult male osprey at Rothiemurchus Fishery in Aviemore. Unlike Blue DF who was colour-ringed as a chick, this new male was unringed and, as a result, we can not be sure if he is a breeding male at one of the local nests, or a youngster yet to establish a territory. Nevertheless this is really excellent news because it means we will be able to follow a second male on its autumn migration, and, assuming the bird survives the winter, collect a great deal of valuable information on its movements once it returns to Strathspey next spring.

Roy preparing to release Blue JV3 after tagging him

The new male, which Roy colour ringed as blue/white JV3, had put on a great deal of fat in preparation for migration and, like Blue DF, set off on migration the morning after being tagged. It had an excellent first day of migration, taking advantage of a north-westerly tailwind and flying 420 km before spending the night beside the River Calder between Leeds and Wakefield. We do not know the exact time that Blue JV3 left Starthspey but at 12:28 (BST – times shown on the map are GMT) he was 11 km north of Pitlochry and two hours later he passed over Edinburgh at an altitude of 1240 m. He crossed into English airspace at around 16:00 and then maintained a south-easterly course along the eastern Pennines before skirting around the east side of Leeds and then settling to roost for the night in trees beside the River Calder.

JV3 spent the night of 14th September beside the Rover Calder near Leeds

This morning Blue JV3 resumed his migration at dawn and headed powerfully south passing over Barnsley and then Sheffield before skirting around the west side of Derby at an altitude of 536 metres. By 08:45 he was approaching Leamington Spa had already flown 158 km from his overnight roost. It will be fascinating to see how far south he is when the next batch of data arrives.

You can check out Blue JV3’s migration on our interactive map.

By 08:45 this morning Blue JV3 had already covered 578 km, having left Strathspey just 24 hours earlier.

Our thanks to Julian Orsi and Rothiemurchus Estate for allowing us to catch and tag Blue JV3.

Slow progress through France

Over the last two days Blue DF has made fairly slow progress through France and at 11:14 this morning was approaching the Atlantic coast, 80 km east-north-east of La Rochelle. You can check out his latest location on our interactive map.

The last GPS fix in the previous update, at 10:37 on Monday morning, showed that Blue DF was heading south through Lower Normandy. That afternoon he continued flying until 14:17 when he was perched beside Étang du Lory, a small lake in a forested area north of Tours. He remained there all afternoon – and presumably caught a fish – after a day’s flight of 120 km.

Blue DF spent much of Monday afternoon beside Étang du Lory and then next morning was perched beside nearby Étang du Petit Puis.

After roosting away from the lake, Blue DF was back at nearby Étang du Petit Puis at first light next morning, indicating that he may have caught a fish before resuming his migration. He set-off again soon after 08:00, passing to the west of Tours and then stopping again for three hours beside the River Vienne near the village of Rivière; so if he didn’t catch a fish earlier in the morning, he definitely did then. The weather was clearly poor for migration because having resumed his journey soon at 14:00 Blue DF only covered another 25 km south before stopping again at another small lake. He remained there for an hour before flying 2km south-west to a forested area to the west of the village of Bethergon where he remained to roost after a day’s flight of just 87 km.

Blue DF stopped beside the River Vienne for three hours on Tuesday – suggesting he probably caught a fish there.

This morning Blue DF was obviously eager to press on because he left his overnight roost soon after first light, on a a south-westerly heading. A strong strong south-westerly wind would have made for fairly tough going, but at 11:14, the last GPS fix in this batch of data, he had covered 70 km, heading towards the coast north of Bordeaux.

Blue DF was approaching the Atlantic coast of France this morning

Finally, thank you very much to Val Gall for sending this superb photo that she took of Blue DF earlier this summer. Our thanks to Julian Orsi and Rothiemurchus Estate for allowing us to catch and tag Blue DF at Rothiemurchus last week.

Blue DF at Rothiemurchus Fishery earlier this summer (photo by Val Gall)

Blue DF heads south

Over the past twenty years Roy Dennis has pioneered the use of satellite transmitters to follow UK ospreys on migration and to learn more about their movements on both the breeding and wintering grounds. Much of this data is in included in my recently completed PhD thesis. This autumn we are tracking a new adult male osprey on migration, Blue DF. This osprey is well known to wildlife photographers because it regularly fishes at both Rothiemurchus Fishery and also Aviemore Lochan – a quick Google search will reveal an array of stunning photos of the bird. He was originally ringed as a chick at nest A18 by Roy Dennis in 2010 and this spring took over from another well-known osprey, Red 8T, at nest A10 in Strathspey. He successfully reared two chicks with an unringed female and by Wednesday evening last week, when we caught him under licence at Rothiemurchus Fishery, his family were already heading south. Blue DF was also ready for migration: he weighed over 2kg having put on around 500g of fat in preparation for his long journey south.

Blue DF is regularly seen fishing at both Rothiemurchus Fishery and Aviemore Lochan (photo by Mike Crutch)

Sure enough when we received the first data from his transmitter at 11:30am on Friday morning he was already in the Scottish borders, 10 km south-east of Kelso. Over the course of the next five hours he made steady progress south-east and at 16:40 he was just east of York at an altitude of 668 metres. An hour later he passed to the west of the Humber estuary and he finally settled to roost for the night in the corner of a deciduous woodland 15 km north-west of Lincoln.

At 09:54 next morning Blue DF had flown over the western part of Lincoln and was migrating south-east, in a strong westerly wind. Three hours later, despite heavy squally showers, he had flown 96 kilomteres from his overnight roost and was heading over Peterborough at an altitude of 682 metres. He maintained a constant south-easterly course through Cambridgeshire and then Essex, crossing the Isle of Sheppey soon after 16:00. He eventually settled to roost for the night in a wood midway between Tunbridge Wells and Folkestone in southern Kent after a day’s flight of 282 km.

Sunday morning dawned sunny and clear on the south coast and DF was obviously keen to press on because at 06:12 he was already 20 km south of Hastings, crossing the English Channel at an altitude of 124 metres. The 117 km crossing took three-and-a-half hours with Blue DF making landfall to the west of Dieppe soon after 09:00. He then continued on a southerly heading through Upper Normandy, at a relatively low altitude (maximum 392 metres) before settling to roost in a forested area near the village of La Saucelle, some 100 km west of Paris after a day’s flight of 277 km.

Blue DF made a 3.5 hour, 117 km crossing of the English Channel between Hastings and Dieppe on Sunday morning. Times and altitude above sea level shown on map

The satellite data suggested that DF hadn’t fed since leaving Scotland but at 09:01 this morning he was fishing in small lake 31 km south-west of his overnight roost. He was obviously successful because the next two GPS fixes (separated by 30 minutes) show he was perched nearby, presumably tucking into breakfast. He didn’t linger for long however because at 10:39, the last GPS fix of this batch, he was 12 km to the south-west migrating onwards at an altitude of 311 metres.  We’ll update you on his progress later in the week. You can also check out Blue DF’s migration on our interactive map. It will be fascinating to see where this experienced adult osprey spends the winter.

Blue DF stopped to fish at a series of small lakes near the town of Nogent-le-Rotrou on Monday morning

Blue DF’s migration from Strathspey to Lower Normandy, 7-11 September