Greenish warbler
Videos
The greenish warbler is a widespread leaf warbler with a breeding range in northeastern Europe, and temperate to subtropical continental Asia. This warbler is strongly migratory and winters in India.
Greenish warbler P. trochiloides from Anamalai Hills, Southern Western Ghats, India
Western greenish warbler, P. (t.) viridanus
Ring species
Videos
In biology, a ring species is a connected series of neighbouring populations, each of which interbreeds with closely sited related populations, but for which there exist at least two end populations i
Herring gull (Larus argentatus) (front) and lesser black-backed gull (Larus fuscus) (behind) in Norway: two phenotypes with clear differences
Ensatina salamanders, an example of a ring species