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The Eurasian blackcap, Sylvia atricapilla, is a common and widespread typical warbler known for its distinctive cap and melodious song. The species exhibits sexual dimorphism with males sporting a black cap and females a chestnut one. The upperparts are generally olive-grey, while the underparts are pale grey. This bird is small and agile, measuring around 13 cm in length with a wingspan of 7–8 cm.
Males can be identified by their black caps and light grey underparts, while females have a reddish-brown cap and a slightly browner hue to their grey upperparts. Juveniles resemble females but have a rufous tinge to their upperparts and a more olive tone on the breast and flanks. The blackcap's tail is dark grey with an olive edge to each feather, and it has a grey bill and legs with a reddish-brown iris.
The blackcap favors mature deciduous woodlands with a well-developed understory. It also occupies parks, large gardens, and overgrown hedges, provided there are tall trees for songposts and dense shrubs for nesting.
This warbler breeds across much of Europe, western Asia, and northwestern Africa. It is a partial migrant, with northern populations wintering in northwestern Europe, around the Mediterranean, and in tropical Africa. Some have adapted to wintering in British and Irish gardens.
Blackcaps are territorial during the breeding season, with males establishing and defending their territories through song and display. They are mainly monogamous and may raise one to two broods per season. The species is known for its leap-frog migration pattern, where northern populations migrate further south than those from the Mediterranean.
