A new analysis of a fossil found in 1889 has unveiled the presence of zeolites—and an entirely new mineralization method.

Long-eared Owls have fluorescent feathers that glow under UV light. These hidden pigments vary by age, sex, and size.

Birds have long been nature’s masters of flight. Their ability to glide, dive, and twist through the air with ease has ...

While there is an astounding variety of physical differences in wildlife that humans can easily observe, new research from ...

published by Chronicle Books 2016 This tail feather comes from a male red bird of paradise. Feathers: Displays of Brilliant Plumage by Robert Clark, published by Chronicle Books 2016 The male and ...