Peacocks reproduce in a way that birds have internal fertilisation,the egg is fertilized inside the female's body. Most birds don't have the male organ - they mate by unrelenting their cloacas organized in what is known as a 'cloacal kiss'. (The cloaca is the single opening birds use to excrete, mate and lay eggs.) The male usually stands on top of the female and places his rump beneath hers to bring their cloacas together. He then releases sperm from his cloaca into hers, where it swims up her oviduct to her eggs, fertilizing and coating them in shell.