Not all mammals have the same reproductive strategies. Compare the reproductive strategies of the cougar and the cottontail rabbit. Mother cougars invest a lot of time and energy into looking after their kittens so that they will reach maturity. Young cougars spend the first year-and-a-half with their mother to learn the rudiments of survival. Mother cottontail rabbits have a different family life. Young rabbits are left to fend for themselves soon after birth, which makes them vulnerable to predators.

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