But it had not, perhaps because of wounds inflicted by the female bird.

Males are generally, but not always, larger and heavier than female birds.

This was surely a female bird, because she was sitting.

Only the female birds incubate the eggs, but both parents care for the young.

He was truly hard up if female birds were turning him on.

The adult male and female birds were identical in external appearance.

The female bird disappeared in April 2004, leaving the male on its own.

Both male and female birds usually take an active part in raising their chicks.

There is virtually no visual difference between the male and female birds.