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As with all marsupials, wallabies give birth to embryonic young that are extremely undeveloped. These tiny newborns are blind, hairless, and about the size of a bean. When they are born, they crawl into their mother's pouch where they attach to one of the teats which swells inside the joey's mouth, ensuring it will not be dislodged when the mother moves.

Wallabies usually give birth to a single baby at a time. Wallabies and kangaroos often mate the same day that they give birth, but the fertilised egg will not develop until the current joey is almost fully weaned - that is, ready to leave the pouch permanently. When the joey is evicted by the mother, the next baby moves to the pouch. Thus, female wallabies and kangaroos often spend their adult life in a permanent stage of pregnancy.

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16y ago

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