Unlike birds whose plumage is mostly blue, the green coloring of a green bird’s feathers is the result of pigment, not a trick of the light. These birds’ emerald green, lime green, chartreuse, or ...

These warblers with similar names look and sound different. Learn to ID a black-throated blue warbler and black-throated green warbler.

In Texas, biologists have documented an extraordinary bird — the natural hybrid offspring of a green jay and a blue jay. Once separated by millions of years of evolution and distinct ranges, the two ...

A male blue jay on the left, a female green jay on the right and a hybrid offspring of the two species in the center. Travis Maher / Cornell Lab of Ornithology / Macaulay Library (left); Brian Stokes ...

A new bird has been discovered in the San Antonio area, a hybrid between two species whose ranges are starting to overlap, in part likely due to climate change, researchers say. Researchers at the ...