Did you know that female kangaroos have two uteri and three vaginas? That way, they can be perpetually pregnant and continue the kangaroo lineage.
That's just one of the surprising animal facts in this week's video from our sister site, Mental Floss. Author John Green describes 51 little-known animal facts, and we guarantee you haven't heard most of them before.
Some of the other facts? Bats account for a full 25 percent of the world's mammal population, with 1,100 species, and reindeer eyes change color depending on the season. The most depressing fact, though, might be that there is actually no such animal as a panther — the word is used to describe animals that are, in truth, jaguars or leopards.
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Check out all of the animal facts in the video below. —Meghan DeMaria
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