Communication is any form of behavior that sends a signal from an animal to another. Examples talking gestures, look, and chemicals. All animals communicate different. Like example of a ant. They use chemical signs there called pheromones to create to show trail, foods, alarm etc.
Horses rub noses as a sign of affection.
Dogs stretch their front legs out in front of them and lower their bodies when they want to play.
Elephants show affection by entwining their trunks.
Suckling is a baby getting milk from its mother. Not all animals do this. Examples there pigs, elephants, and even humans. There only given by females.