Two factors that appear to be regulating the cycles of some showshoe hare populations are

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The cycles of some showshoe hare populations are likely regulated by two factors - food plants and predators. As the population of hares increase, they consume more food, which eventually decreases the availability of food. This leads to a decrease in the population size of hares due to starvation. On the other hand, predators such as lynx may also have a regulating effect on hare populations as they prey on hares. Together these two factors likely contribute to the cyclic nature of some showshoe hare populations.

Two Factors That Appear to Be Regulating the Cycles of Some