A new study shows that one group of Galápagos yellow warblers responds to intruders more aggressively than others. It adds ...

Most birds with bright yellow or red feathers — think goldfinches and cardinals — use pigments called carotenoids to make those colors. "The reason that a bird's egg's yolk is a bright yellow ...

Many bird species feature colorful plumage in North America. Discover 11 beautiful yellow and black birds and learn about their locations, habitats, and behavior. The American goldfinch is common ...

Some birds like the Yellow-naped amazons (Amazona auropalliata) that dart across trees from Mexico to Central America also appear to have regional dialects. The findings are detailed in a study ...

Illuminated by blue and UV light, the birds’ white and bright yellow plumage broadcasts colors that may be used in territorial disputes or for finding mates, according to the study.

Males have bright yellow feathers covering most of their bodies, with a reddish-brown “cap” atop their heads during the breeding season. They are territorial birds that defend their turf from ...