Quote:
Originally Posted by (E)
Kangaroos have a couple of useful reproductive adaptations. They can delay the onset of pregnancy after conception as well as selecting the gender of their offspring.
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They can also abort, like rabbits. More radically, a Kangaroo can effectively be pregnant with two joeys at different developmental stages plus be nursing a third - one joey is a fetus or earlier, one is a "jellybean" stage half-fetus attached to a nipple like a placental mamal and an umbilical cord, and one is a normal "joey", who uses a separate nipple to nurse.
Jellybean is the technical term, I'm not joking. The front end is like a placental infant, the back end is like a fetus. It's wacky.