Oliver Buckle
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Populations in the wild fluctuate a lot. If only a couple of butterflies survive a bad winter they can lay a couple of hundred eggs each, and the larvae won't be facing the usual competition. That's a hypothetical, but I heard a guy who had been studying robins in a large country park. They caught a virus that all but wiped them out, something like 98% death rate, but had recovered to normal numbers within two years.

