Primates

We watched a video about gorillas in class recently and these are my observations of them

- They're feet have a gap between the big toe and the other toes
- They usually walk on all four limbs, only sometimes on their two feet without using their arms
- After running for awhile, they get up on their feet only and pump/hit their chest
- They rest on the back of their hands while walking on all fours
- Their arms are longer than their feet
- They are hunched over

These are some questions I have on them

- Why do they pump/hit their chest?
- Why do they move on all fours sometimes, and on two feet at other times?
- Why is there a large gap between their big toe and the rest?
- Why is their skin rough?
- How long can primates walk only on their feet?
- Can primates swing on trees?