Nest noises are the sounds made by birds, especially those that live in nests. The term 'nest noises' can refer to three distinct sounds: PEEPS, cheeps, and CHIRPS. PEEPS are short, high-pitched CHIRPS made by young birds. Cheeps are similar to PEEPS but are slightly louder and more frequent. CHIRPS are longer, lower-pitched sounds made by adult birds. All of these sounds are used by birds to communicate with each other and to attract mates.