#11 Bristles also form a lifelong union. If they separate for any reason, they float over the coral reef and look for each other.
#12 Not yet hatched chicks communicate with each other and with their mother.
About a day before hatching, you can hear the squeak of a chicken. When Mom hears a squeak, she starts to cluck in response, thereby calming the agitated chicken.
There are about 24 sounds that chickens make from eggs when communicating with each other.