The first CES visit on Sunday was carried out in windy conditions that made the prospect of a good catch remote. We did manage 36 birds though including Blackcap, Chiffchaff, Garden, Willow and Reed Warblers, some of them wearing rings from previous years. The next visit is planned for this coming Sunday.
We had some good opportunities to compare brood patches. See pictures below for good examples of the three main stages:
BP2 - bare, full of blood vessels, but muscle and gut still visible
BP3 - skin opaque, thickened and engorged
BP4 - breast and gut visible again, skin with many thin wrinkles.