Many species have a pouch (marsupium), a fold of skin covering the nipples on the mother's lower belly, where the young continue their development.
许多品种都有一个育儿袋(marsupium),是下盖的皮袋,幼袋内继续发育。
Many species have a pouch (marsupium), a fold of skin covering the nipples on the mother's lower belly, where the young continue their development.
许多品种都有一个育儿袋(marsupium),是下盖的皮袋,幼袋内继续发育。
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