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 ...

Filoplumes may be tiny, but these hairlike feathers enable nonstop flights that span thousands of miles. Filoplumes may be tiny, but these hairlike feathers enable nonstop flights that span thousands ...