A kangaroo embryo is less than 2cm in length (less than an inch) when born and weighs about half a gram. It is about the size of a kidney bean. It is blind and hairless. However, this embryo makes it way from the birth canal of the mother kangaroo up to and into the mother's pouch. It then latches onto a teat inside the pouch, which then swells inside the mouth of the joey, basically securing it from falling or being jolted from the pouch.
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