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https://bronxzoo.com/animals At birth, the Matschie’s tree kangaroo joey was the size of a human thumbnail, but already the baby is poking its head out from mother Polly’s pouch! At around seven months old, it will emerge fully, returning frequently to the pouch to nurse. Most of the newborn’s physical development occurs in the mother’s pouch, giving guests a unique opportunity to observe one of nature’s most intriguing evolutionary adaptations.