Gorillas communicate with each other through a variety of vocalizations, facial expressions, and body language. They use vocalizations such as grunts, roars, and barks to express emotions and alert other gorillas of their presence. They also use facial expressions, such as lip-smacking, teeth-grinding, and head-bobbing, to communicate. Additionally, they use body language, such as chest-beating, arm-waving, and hooting, to express dominance.