-supports the upper body, protects the organs inside the pelvic, serves for attatchment of the legs
-consists of the two coxal bones & the sacrum and coccyx of the vertebral column
1. Hylpbatidae- lesser apes
(gibbons and siamangs)
2. Pongidae- greater apes (orangutans, gorillas ,bonobos and chimps)
3. Hominidae (humans)
What is this an example of?
o An individual physically defends the offspring of its siblings from an attacker
§ Personal risk: injury or death
§ Personal gain: preserve reproductive potential of individuals when shared with group ?