Some interesting bits about UV in the last couple of days

After the excitement of UV’s move away from Cintra there was a bit of time today to look more closely at some aspects.


As mentioned previously, UV left his inital roost on 21 January and travelled over the sea in the dark. He never really settled at Cabo Blanco; the oil refinery with the light pollution and greater human activity could have been the reason. Here is an image showing how ‘fidgety’ he seemed, flying down to the very end of the peninsula at around 19.00 GMT -well after sunset – before returning to the same area. The second time he left, that was it, despite that sea to cross! The colours on the arrows darken as the time passed.

UV is unsettled

UV is unsettled

The next night was a more routine desert roost. He has become used to those. Then last night he found a roost 7H would feel at home on – a pylon, actually two!

UV roosts on power transmission line pylons

UV roosts on power transmission line pylons

Paul spotted that and identified the line as the long distance 225kv transmission line that carries power from the Manantali hydro-electric scheme in Mali. Some towers are over 45m tall and can carry six independent circuits, but UV chose slightly shorter ones judging from the altitude readings.


UV travelled at speed (with strong tailwind aid) and height most of the time on 21 January when he left Cintra. He covered 314 km in about 5 hours. The next two days were more of a dawdle; he travelled 520 km further in total, mostly at significantly lower altitudes. But not always. He was near or over the sea much of the time on both days. Here is a graphic from Paul which explains what he was doing.

UV's flight strategy on 22 and 23 January

An example of UV’s flight strategy on 22 and 23 January

Some other well known ospreys

Now he is on more familiar osprey migration territory UV will experience more competition for food. Already he has passed close to where an experienced Scottish adult female, Morven, overwinters on the coast in Mauritania. On 22 January he roosted about 10 km from where the Dyfi Osprey Project‘s juvenile male Ceulan roosted on 12 September 2012 during a very speedy migration. Breagha, a 2013 Loch Garten male now in Southern Senegal did a ‘double back’ in late 2013 into the area UV was today. That area is a Mauritanian National Park, Diawling, which is a haven for bird life. But UV looked as though he was heading on today.

Blue 7H

We did not receive any data yesterday and there is none so far today. She was fine on Wednesday and Thursday.

This entry was posted in Blue 7H, Blue UV, Migration, Osprey updates and tagged , . Bookmark the permalink.

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