| Allogrooming | reciprocal cleaning of the fur |
| Allomothering | care for an infant by a group member other than itsmother/ like baby-sitting |
| Arboreal | adapted to life in the trees |
| Biped | animal that uses two limbs for locomotion |
| Brachiation | swinging with arms from branch to branch |
| Cathemeral | active periodically throughout the day and night as inlemurs |
| Consort | a friendship between a male and female-to temporarily associateand travel together to enhance male's chance of paternity |
| Crepescular | active in the twilight- mostly at dawn and dusk |
| Diurnal | active during the day |
| Estrus cycle | the period around ovulation when females are willingto mate - indicated by perineal swelling or pheromonal or behavioral signals |
| Faunivore | an animal that eats other animals as a major part of itsdiet |
| Fission-fusion community | a social structure in which individuals ofa troop split to forage and meet up again as a large group when food sourcespermit |
| Folivore | leaf eater |
| Frugivore | fruit eater |
| Gestation | period between conception and birth |
| Graminivore | an animal that east grass seeds and grains as a majorpart of its diet |
| Infanticide | the deliberate killing of infants by members of their own species |
| Juvenile | an individual between infancy and sexual maturity |
| Lipsmacking | a gesture that many primate species use as a friendlysignal when approaching another individual |
| Nocturnal | active during night |
| Noyau | a social structure in which a male's territory overlaps thesmaller territories of several females |
| Nulliparous | a female that has not had offspring/ small nipples |
| Parous | female that has had offspring/ long distended nipples |
| Prehensile | able to grasp by wrapping around/ often refers to the tailof some larger Neotropical monkeys |
| Quadruped | animal that uses four limbs for locomotion |
| Rhinarium | the moist part around the nose that enhances smell in someanimals, including dogs and prosimians |
| Sacculated | divided into small chambers |
| Sexual dichromatism | color pattern variation between genders of thesame species |
| Sexual dimorphism | size, color or weight variation between genders ofthe same species |
| Solitary foragers | search for food spending most of time along |
| Subordinate | lower ranking in a hierarchy and therefore giving wayto dominant individuals |
| Suspensory Behavior | hanging, climbing or moving below tree branches |
| Tapetum | reflective layer in the eyes of nocturnal animals |
| Terrestrial | adapted to life on land |