Even though most people refer to both sexes as peacocks, only the males are called peacocks. The females are called peahens. And peafowl is the term for both.
Peacocks use their bright iridescent trains to attract peahens. Another technique males use is quivering their feathers to produce infrasonic sounds (low frequency).
Baby peafowl are called peachicks! Male and female peachicks look the same until about 6 months when the males start to grow their bright colored neck feathers. They do not grow a train (long feathers in the back) until they are 3 years old.
Eye of the Wild Photography 