We usually think of seasonal changes in terms of the weather, what we eat, or the clothes we wear. But in nature, some changes happen in ways that are deeper and more subtle. Most birds keep the same ...

Unlike birds whose plumage is mostly blue, the green coloring of a green bird’s feathers is primarily a combination of ...

This round-bodied gray bird with short wings and a stubby tail ... the bird’s superpowers include: extra layers of feathers covered with a thick coating of oil wax for waterproofing; a low ...