A “very rare” love triangle involving three ospreys is being captured on a livestream camera for what is thought to be the first time. The trio of birds – one male and two female – are sharing a nest ...

Researchers have discovered an extraordinary, vibrantly colored tropical bird with "female" feathers down one side of its body and "male" feathers down the other. Female green honeycreepers ...

In humans, it’s the sperm that determines whether an embryo is pushed along a male or female development pathway. But in birds, it’s the other way around. Eggs are the deciding factor in bird sex.

Experts uncover exceptionally rare bilateral gynandromorphic birds displaying both male and female characteristics in Colombia. The bird's distinct half-green (female) and half-blue (male ...