Feathers are among the most complex cutaneous appendages in the animal kingdom. While their evolutionary origin has been ...
The lammergeier, commonly known as the bearded vulture, is a unique bird of prey that primarily eats bones. Skeletal matter, ...
They are one of North America’s largest, fastest birds of prey and look remarkable as they soar through the air with their golden feathers gleaming in the sunlight. Golden eagles can reach ...
A survey of museum specimens reveals that more than a dozen species of the birds sport biofluorescence in feathers, skin or even inside their throats.