I wonder why．Kangaroos have pouches and other quetions about baby animals I wonder why kangaroos have pouches :: and other questions about baby animals / Kangaroos have pouches and other quetions about baby animals I wonder why camels have humps and other questions about animals Originally published: as I wonder why kangaroos have pouches and other questions about baby animals. 1996 I wonder why．Camels have humps and Other Questions About Animals I wonder why trees have leaves and other questions about plants I wonder why trees have leaves :and other questions about plants I wonder why planes have wings and other questions about transport I wonder why zippers have teeth and other questions about inventions