 Deer communicate with contact calls, alarm calls and other calls to signal when they are ready to breed, to feed, to locate others in their group, after they have shed their velvet, to signal frustration, to summon nearby deer and to intimidate unwanted visitors.A ring-tailed lemur's contact call is used heavily to communicate and is classified on the level of excitement the lemur achieves in a situation.When low to moderately excited, the lemur moans; a "meow" is heard when the excitement is raised to a moderate level or when a situation will bring group togetherness.