New Guinea is home to some of the world’s most toxic birds. Why they contain poison, and how they withstand it is still a ...

Black swifts, with their preference for nesting on steep, wet, cold rock faces, are among the most enigmatic birds in North America. JT Thomas On a hot, dry July evening, a dentist named Mike ...

They are among North America’s most numerous invasive birds. They’re glossy greenish ... tundra and trumpeter swans by its ...

“For me, the great joy in life today is traveling across the face of North America ... and their black-tipped bills shift from pink at the base during the non-breeding season to orange in ...

Multicolored birds were developed over centuries of near domestication. Polytypic (12 ssp.; nominate in North ... iris orange to red; orbital skin blue-gray; bill grayish black; and feet dark ...

Often taken for granted, the brightly plumaged male summer tanager is one of the more spectacular breeding birds of North America ... generally mustard yellow-orange, with greener wings and ...