Can you solve this riddle?

A certain large animal lives happily and thrives here on Earth. One day, every single one of these critters is wiped out by a mysterious disease which affects only this particular animal. There are none left anywhere on earth -- they are all gone. About a year or so later they begin to reappear on Earth again. How can this be?

The animal is the mule. Since all mules are born sterile, you can only get a mule by crossing a donkey with a horse. That is how the species is able to repopulate itself.

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