Ritualized aggression

Ritualized aggression involves a graded series of behaviours or displays that include threatening gestures (such as vocalizations, spreading of wings or gill covers, lifting and presentation of claws, head bobbing, tail beating, lunging, etc.)

Spider monkeys (genus Ateles) defend their territory by screams, barks, rattling or dropping branches, and urinating and defecating on intruders below.

[2][3] Oscar cichlids (Astronotus ocellatus) are able to rapidly alter their colouration, a trait which facilitates ritualised territorial and combat behaviours amongst conspecifics.

Male ring-tailed lemurs have scent glands on their wrists, chests, and in the genital area.

[6] The creek chub (Semotilus atromaculatus) engages in ritualized aggression when others of the species invade its territory.