Willow warblers look almost identical to chiffchaffs. Telling these two warblers apart is extremely tricky visually, though they can easily be identified by their song. Tiny willow warblers produce a most beautiful liquid warble that rises in volume. One of Britain's most abundant warblers, they build distinctive, dome-shaped nests with a hole in the side, close to the ground. Into these oven-like nests, very small eggs are laid - eggs so tiny that three weigh the same as a one pence coin. Unusually for birds, they moult their feathers twice a year.
Scientific name: Phylloscopus trochilus
The following habitats are found across the Willow warbler distribution range. Find out more about these environments, what it takes to live there and what else inhabits them.
Discover what these behaviours are and how different plants and animals use them.
Additional data source: Animal Diversity Web
In 2010 Springwatch followed a family of willow warblers who have constructed a low-laying nest at Pensthorpe.