• luves2spooge@lemmy.world
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    2 years ago

    It depends if their progeny can reproduce. A male donkey and a female horse can make a mule but mules are sterile.

    • Soggy@lemmy.world
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      2 years ago

      Not that simple. Brown bears and polar bears produce fertile offspring, as do bison and cattle, and the false killer whale with a bottlenose dolphin. (Far from an exhaustive list)

      It’s generally a useful definition but it isn’t a “rule”.