Why don't things at the top of the food chain have large populations?

by Anonymous
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Things at the top of the food chain eat, but are not eaten. If they're "top dog" in the wild, then why aren't there lots of them in the wild? They can reproduce and their offspring won't be eaten by anything. Sickness and starvation can kill a few, but with prey sickness and starvation kill a few too. So how is it that there aren't lots of predators, the prey is over-hunted and the ecosystem collapses?

Read Food Chain.

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