The urinary tract goes through the middle of the three vaginas, which may be why joeys are so small (40,000 times smaller than adult kangaroos) — there’s no room for a bigger birth canal with the urinary tract in the way.
Because they have two uteruses plus a pouch, to go with the two sperm-vaginas, male kangaroos often have two-pronged penises, that explains why female kangaroos are perpetually pregnant.
source: grist.org
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