The Icterine Warbler (Hippolais icterina), is an Old World warbler in the tree warbler genus Hippolais . It breeds in mainland Europe except the southwest, where it is replaced by its western counterpart, Melodious Warbler. It is migratory, wintering in sub-Saharan Africa. This small passerine bird is found in open deciduous woodland with bushes and also parks and gardens, often near water.
This is a medium-sized warbler, around 5 inches in length, similar to Melodious Warbler. The adult has a plain greenish-brown back with a paler wing panel, and yellowish underparts. The bill is slightly orange, strong and pointed, and the legs blue-gray. The sexes are identical, as with most warblers, but young birds are paler on the belly. The song is a fast nasal babbling incorporating mimicry of other species.
Like most warblers, Icterine is insectivorous, but will take other small food items including berries. Four to six eggs are laid in a nest in a tree or a bush. It is colloquially referred to by birders as Icky.