It has been nearly two weeks since an update on UV and mostly his activity can be summed up as ‘more of the same’. Over several consecutive days he can perch for most of the time in one small area then desert what appeared a favourite place. Whilst a few sites – for example the island of Doune Baba Dieye – are frequent destinations UV has found some new perches recently. Mostly they are in scrub rather than right on the coast.
There are exceptions but UV returns to a roost area at or after sunset – around 19.00 – most days and he is recorded over water just before sunrise (about 07.30) often enough to conclude he usually forages early.
As we’ve said previously UV flies over the river or sea more times each day than is necessary for his energy requirements. The following images show different behaviours.
These high flying trips out to sea could be looking for shoals of fish. Still the authority, the University of Edinburgh 1982 PhD, The Wintering Ecology of Ospreys by Yves André Prevost had this to say:- “When foraging 1 to 5 km out at sea, for sardines or flying fish, Ospreys often rose up to an estimated height of 300 m, apparently to locate fish, then came down slowly before diving from up to 100 m.”
But today UV flew about 3.5 km out to sea at relatively low altitudes.
The fixes were between 5 and 10 minutes apart and UV could have been higher and faster in between them. The group of fixes below 09.34 were mainly 20 minutes apart and he could have been perched somewhere between them, but that area is a favourite hunting ground.
Until recently UV hadn’t been going so far out to sea. We’ll explore why this change may have occurred in a future post.
On 13 January UV displayed more typical behaviour for recent weeks, staying fairly close to shore.
The yellow-circled fixes appear to show UV perched in water but the sand in all those areas is probably above sea level most if not all of the time nowadays.
Finally, on 16 January UV explored around the National Park area of the Langue de Barbarie, his original ‘home’ there.
It looks as though he was heading inland when something attracted his attention – perhaps ospreys or gulls showing interest in a shoal? – and off he went to join in!