One example of extra-pair fertilization (EPF) in the birds is the black-throated blue warblers.

The call also resembles that of the Black-throated blue warblers, which is a member of the New World Warbler family.

The scientists routinely counted all birds in their survey area, but focused on two species: the American redstart and the black-throated blue warbler.

More of these birds, like black-throated blue warblers and Canada warblers, were breeding, while in the disturbed area most were migrating.

Especially the black-throated blue warbler, Mr. Gomez added.

The North American bird, black-throated blue warblers, is another example.

The spring warblers of North America are a typical example; see, for example, the black-throated blue warbler.

Similar results have been obtained with fish and birds (e.g. the black-throated blue warblers).

The black-throated blue warbler mostly forages in the understory instead of the canopy.

The black-throated blue warbler, an Eastern songbird that winters in the Caribbean, has some ingrained migratory habits, too.