Willow Warbler - Subspecies

Subspecies

Three subspecies are accepted, with a partly clinal reduction in green and yellow plumage tones from west to east, with central birds browner and easternmost birds predominantly greyish:

• Phylloscopus trochilus trochilus (Linnaeus, 1758). Breeds Europe (from the Pyrenees and Alps northward) except northern Scandinavia, winters west Africa.
• Phylloscopus trochilus acredula (Linnaeus, 1758). Breeds northern Scandinavia east to western Siberia, winters central Africa.
• Phylloscopus trochilus yakutensis (Ticehurst, 1935). Breeds eastern Siberia, winters eastern and southern Africa.