Latin name - hylloscopus trochilus
Willow warblers are small birds with grey-green backs and pale under parts. They have a yellow tinged chest and throat and pale supercillium (the stripe above the eye). They are separated from the very similar chiffchaff by their song. Their population, especially in southern Britain, has undergone a moderate decline over the past 25 years making them an Amber List species.
Willow warblers are widespread and can be seen in suitable habitat across most of the UK. April-September
What they eat: A wide variety of small insects and spiders. Fruit and berries in autumn.
(Info courtesy of rspb.org.uk
AKA: Winter wren (N America)
The wren is a tiny brown bird, although it is heavier, less slim, than the even smaller goldcrest. It is dumpy, almost rounded, with a fine bill, quite long legs and toes, very short round wings and a short, narrow tail which is sometimes cocked up vertically. For such a small bird it has a remarkably loud voice. It is the commonest UK breeding bird, although it suffers declines during prolonged, severely cold winters.