Scientists find that 82 percent of birds-of-paradise species show biofluorescence, often on their feathers, throat or inner ...

Unlike mammals, birds lay eggs and initial stages of development occur outside the mother’s body. Reproductive system of birds The gonads develop from two sources during embryonic development. When ...

Photograph by TUI DE ROY, MINDEN PICTURES During a courtship display, each male seeks to outdo the others with one body part ... of Nature ranks the bird “least concern,” but invasive species ...

Before the 1940s, biologists relied on a system called the Linnaean method ... must rely on external sources of heat to ...

“The average bird ... body they infect, but have more chances to do so in people who are immunocompromised or have underlying health conditions that make it more difficult for their immune ...