Mist netting 10/4/26....the migrants are here!

Things have picked up! A group of us had a session in the vicinity of the Discovery Hut which proved to be a different kettle of fish to the last one.....the migrants have arrived and gave us an interesting morning. We set seven nets and caught 36 birds of 13 species. Our very first bird was very exciting....a Reed Warbler that had been ringed by the Group on 17/6/2017, caught twice in 2018, and hadn't been caught again until today. The life expectancy of a Reed Warbler is about 2 years, and as this bird was an adult when it was ringed, it must now be at least 10 years old.  It's amazing to think of how many miles it must have travelled going backwards & forwards to sub-Saharan Africa each year, a total distance of about 54,000 to 60,000 miles. In an odd coincidence, it was in 2017 that we last caught a Reed Warbler that was of a similar age...we caught a bird on 24/5/2017 that had been ringed as an adult on 16/7/2009, making it at least 9 years old. The oldest recorded Reed Warbler was 12 years, 11 months & 21 days old, so just a couple more trips & our bird will be a record breaker. 

A very well travelled 10+ year old Reed Warbler

Reed Warbler wing 

We caught three Willow Warblers, our first of the year. They also migrate to sub-Saharan Africa for the Winter. Adult Willow Warblers undergo two complete moults each year, one after breeding before leaving the UK, and one whilst in their wintering quarters in Africa. The juveniles undergo a partial post-juvenile moult, and then also complete a full moult in Africa before returning. Therefore, there is no way to age a returning Willow Warbler.

Willow Warbler

Willow Warbler wing

Willow Warblers are often more yellow and have paler legs than a Chiffchaff. However, there's a lot of individual variation, and some can be hard to tell apart. Before ringing, it is therefore necessary to correctly identify which species you have. This is done by looking carefully at the Primary feathers. On a Willow Warbler, the outer vane is emarginated (ie narrows) only to the 5th Primary feather, whereas on a Chiffchaff the 6th feather is also emarginated. As the wing shape is also slightly different, the length of the 2nd Primary on a Willow Warbler is roughly the same length as the 5th or 6th Primary, whereas on a Chiffchaff it would be about the same as the 7th or 8th. 

Willow Warbler wing

We did catch four Chiffchaffs, which did show the typically duller plumage when compared to the Willow Warbler. 

Chiffchaff

We also caught the Group's 21st Woodpigeon, an adult female with a large brood patch,  indicating that she's actively breeding. 

Woodpigeon

Woodpigeon uniform adult wing

One Reed Bunting was caught, which had been ringed as a young male on 2/11/25. 

Male Reed Bunting (age code 5)

	Ringed	Retrapped
Reed Warbler	1	2
Cetti’s Warbler	1	1
Willow Warbler	3
Blackcap	7
Sedge Warbler	5
Wren	1	1
Reed Bunting		1
Chaffinch	1
Blackbird	2
Chiffchaff	3	1
Blue Tit	1	2
Dunnock		2
Wood Pigeon	1
	26	10

There were plenty of Sand Martins whizzing about over the reeds & visiting the nesting wall. So far at least 19 nest cavities are being visited & contain nesting material, and two of the nests already contain an egg. Sadly there are at least two less Sand Martins than arrived back from Africa. One was taken in the air by a raptor, and one was taken from the front of the wall by a Moorhen, which then drowned the Sand Martin before swimming off with it. The wall will be monitored weekly & the youngsters ringed when old enough. 

We have also received very late notification of a Reed Warbler which was ringed by the Group on 17/6/25 as a juvenile bird, and which was subsequently caught on 16/8/25 in Caminha, Viana do Castelo, Portugal, 60 days & 1077km later.