Animals have sex in all sorts of weird and wonderful ways. Birds have sex via an internal chamber called a cloaca that is present on both male and female animals.

Male Japanese quails produce a strange seminal foam that appears to enhance the chances of successfully fertilizing an egg.

Reproductive system of birds. The gonads develop from two sources during embryonic development. When the nephric ridges are well established, genital ridges appear on their surface. This tissue forms ...

Male birds that eat mercury-contaminated food show "surprising" homosexual behavior, scientists have found. In a recent experiment in captive white ibises, many of the males exposed to the metal ...

Exposure to mercury pollution could be hitting some wild birds' reproductive prospects hard by causing males to pair with other males. American white ibises (Eudocimus albus) from south Florida ...

In a paper published in Nature Communications on January 22, 2013, a team of paleontologists including Dr. Luis Chiappe, Director of the Natural History Museum of Los Angeles County's (NHM ...