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 Post subject: Early juvenile Swallow
PostPosted: Mon Jun 05, 2017 11:37 am 
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Joined: Fri Apr 01, 2011 9:28 pm
Posts: 112
Location: Bryncroes
While netting at the Afon Wen reedbed, near Chwilog, at dusk on
Friday 2nd June, a few Swallows came in to roost in the reeds.

At this time of year these are mostly adult males breeding locally.
However, one bird caught and ringed on Friday was a juvenile with
fully grown wing and tail feathers.

Our local Swallows are still either on eggs or have small chicks with
emerging primaries, so this juvenile will have been raised much
further south.

Some Swallows in SW Spain fledge their first broods in late March or
early April, see for example De Juana & Garcia 'The birds of the Iberian
Peninsula' 2015 or British Birds 64: 127 (1971). Occasional juveniles
are sometimes found in the UK in May and there is even a mid April record
from the Channel Islands, British Birds 84: 572 (1991). These early
juveniles are suspected to have joined northern adults which are still
migrating through the Mediterranean region in April and May.

Phil B
Bryncroes


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PostPosted: Wed Jun 07, 2017 2:54 pm 
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Joined: Wed Apr 14, 2010 10:09 am
Posts: 91
Location: Morfa Nefyn
Thanks for posting that. Fascinating.


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