Glossary of Terms
Arboreal: spend time in the tree canopy
Brachiator: arm swinging with feet used as support. Also includes climbing and hanging by feet.
Coelom: a fluid-filled cavity found in an organism. Allows for an increase in body size.
Estrus: changes in sexually mature females that are caused by reproductive hormones. Begins after puberty. Humans undergo a similar cycle called the menstrual cycle.
Heterotroph: an organism that feeds on others
Pleistocene: most recent period of glaciations lasting from 1.65 million to 10,000 years ago.
Sexual Dimorphism: a difference seen in male and female Orangutans. Males are normally twice the size of their female counterparts.
Terrestrial: spend their time on the ground
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