Reading: Animals group have two kinds: closed (don't accept others) and permeable (welcoming the others). Permeable group is better because new members bring new knowledge.
Listening: chimpanzee is a good example, they leave home since they grow up, join into a new group. And all are friendly easy to live. Bring new knowledge, different chimpanzee live in different place before. One chimpanzee perhaps use sticks to get eggs from nest. Others watching him while he is doing this, and they learn that too.
The material introduces two kinds of animal groups. The first is called closed group, which refuses to accept members from other groups. The second is called permeable group, which welcomes members from other groups. This is positive, as new members tend to bring in new knowledge. The professor then talked about an example of chimpanzee. They will leave home after growing up, and join into a new group. And all are as friendly and easy to live in the new group. Besides, as different chimpanzees live in different places before, they bring in new knowledge. One chimpanzee perhaps uses sticks to get eggs from nest. Others watch him while he is doing this, and they learn that too.
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