Do they just not want somecrab standing on top of them? Is it involuntary?
In: Biology
They aren’t trying to pull each other down, they are all just trying to climb at the same time, and in doing so, pull each other down. Each individual crab is doing what is best for it to get higher in the short term, but make long term escape impossible.
Humans do the same thing. When there is a fire and a big crowd is trying to exit through a door that opens in, everyone rushes to the door, thinking they are getting closer to escaping, but they actually are only pinning the people in the front against the door, making it impossible for it to be opened.
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