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Greenish Warbler was created in 1837.
The greenish warbler migrates from the Tibetan Plateau to India every year. During their migration, two species of greenish warblers met up, but didn't interbreed, therefore these birds are still two separate species. Because these birds are so closely related, it is rare that interbreeding didn't occur.
The cuckoo is a parasitic bird (with only a few exceptions), meaning it relies on other birds to nurture its chicks. So the relationship between a cuckoo and a warbler is that the cuckoo lays one of its eggs in the warbler's nest and the warbler ends up raising a cuckoo chick.
It is called the Connecticut Warbler because the first specimen was collected in Connecticut and it's a type of warbler.
Canary, goldfinch, yellow warbler, prothonotary warbler, Wilson's warbler, Bachman's warbler, prairie warbler, pine warbler, western tanager, common yellowthroat, yellow breasted chat. Many warbler specie's plumage contain yellow to some degree.
If it's in the Northern Hemisphere and sort of greenish, the size of a Robin, it's probably a either a Bohemian or Cedar Waxwing. See links below.
An aquatic warbler is a small bird of the warbler family, Latin name Acrocephalus paludicola.
A Blackburnian warbler is a small New World warbler, Latin name Setophaga fusca.
The hooded warbler is not endangered..Least concern by the IUCN.
A parasitic relationship. The cucko lays its eggs in a warbler (E.g Reed warbler)
A warbler finch is a bird, one of Darwin Finches in the tanager family. There are two types of warbler finches, the green and the grey warbler finch.
Bachman's Warbler was created in 1833.