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If they seem like they're increasing in numbers, it's because they are!
Just like there are more squirrels this year.
If we have a wet and warm spring, the squirrels, chipmunks and most other rodents will breed more than once, and start ealier than usual. The reason is an ample supply of food, mainly seeds and berries. The forces of nature will take their toll as the number of predators increase as well, and finally when winter comes again, they will not all survive.
We go through cycles like this every few years.
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