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

Singing is an important part of the breeding cycle, which begins when migratory male birds reach their nesting grounds. They usually arrive before the female birds, giving each male time to ...

New research out Tuesday in the journal Human Reproduction reveals that microplastics are coming for our baby-makers, too. In ...

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.

The standard theory is that the harmful fitness effects of extravagant display plumage are part of how the display works: if a male bird is able to survive and thrive despite carrying around a ...

Birds-of-paradise are even colorful in the dark, with feathers and body parts that glow a brilliant yellow-green under ultraviolet (UV) light, a new study found.

Discover how climate change disrupts bird breeding patterns, causing phenological mismatches and habitat loss. Explore parallels to human fertility and global reproductive health challenges.

Male Reproductive Health Issues: Poor sperm health, hidden infertility, low testosterone, and impotence—discover 5 common yet ignored male reproductive health problems and how to spot early signs.

Neighboring groups of birds within the same species can create very different-looking nests — showing that their nest-building choices aren't solely controlled by instinct and the environment ...