Which mammal has the shortest known gestation period, an average of just 12.5 days?

And this isn't the only opossum claim to fame! It's also the only marsupial found in the entire U.S., as well as the only mammal with a prehensile tail. Also notable, if slightly less impressive, is that opossums have the smallest brain-to-body ratio among all mammals.... on the entire continent.

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