Eagles communicate with each other using various vocalizations and body language during different activities such as hunting, nesting, and defending territory. They have distinct calls for different situations, such as high-pitched screams when defending their territory, softer calls during nesting, and screeches or chirps during hunting. Additionally, eagles use physical displays like posturing, wing flapping, and talon movements to communicate with each other. This communication helps them coordinate their actions and maintain their social structure within the group.