Phenylacetonitrile, or PAN for short, normally governs swarming behaviour in adult males who also use it to warn other males to leave them in peace while they mate.
Most adult males are all Black; most females are marked with white Below. Both sexes have a Bare-skinned throat pouch, tiny feet, and a long hooked Bill that is used to attack and rob other seabirds of their fish.
As a rule chimpanzees move about in one of four types of band: adult males only;
And the problem could even worse than it appears, he said. Snares catch musk deer of all ages and both sexes indiscriminately—but only adult males have musk glands.