Ringtail lemurs have one of the most unique conflict-resolution tactics of all animals: stink fights. Since lemurs live in large social groups of 20 to 30, breeding season can bring a lot of competition. Male ringtails have scent glands on their wrists and shoulders. The wrist gland produces a volatile, short-lived odor, while the shoulder gland produces a brown, toothpaste-like substance, which is much longer lasting. Basically, male lemurs wave their tails and waft a fragrance toward their rivals, resulting in a smelly standoff until someone backs off.