题目内容
Mental ability tests are given to animals to determine particular levels at which they can think about soemthing that is not around.
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Raccoons have more highly evolved brains than rats and dogs for memorizing things.
Birds have many unparalleled skills because of their unparalleled insight.
One crucial ability which is characteristically man's property is the ability of abstract thinking.
What is the commonest way used to learn about the stages of intelligence in animals?
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