Most Male Birds Have a Retractable Penis Used to Inseminate

Question

Most male birds have a retractable penis used to inseminate the female during copulation.

Accepted Answer

Most male birds do not have a penis; instead, they mate through a process called "cloacal kissing," where the male and female cloacas touch to transfer sperm. Only a few bird species, such as ducks and ostriches, have a retractable penis.