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I recently learned that female kangaroos typically rear multiple young at once, even producing different types of milk for neonatal joeys and older joeys. I've read that the older joey can enter and exit the pouch at will, whereas the neonate is the size of a lima bean and clings to a teat.

My question is: seeing as the newborn is so small and presumably fragile, how does it safely share the same pouch with its much larger sibling, even while the larger sibling climbs in and out of the pouch (having, I assume already developed claws which might injure its sibling)?

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