The female koala has a backward-opening pouch because it makes it easier for the young koala to feed once it gets older After a baby koala is about 28-30 weeks old, the mother produces a substance called pap. This substance is actually a specialised form of the mother's droppings which, having passed through her digestive system, give the joey the enzymes it needs to be able to start digesting the tough gum leaves, making an easier transition for the baby koala to start eating eucalyptus leaves. The koala joey's head just needs to emerge from the backward-opening pouch to feed on this pap.
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