Do Kangaroos Have An Amnion?
Do Kangaroos Have An Amnion? Dorsal nerve cord and notochord: in all seven species • Paired appendages and spinal column: in all species except lamprey • Paired legs: in all species except lamprey and tuna • Amnion: in all species except lamprey, tuna, and bullfrogs • Mammary glands: in kangaroo, rhesus monkeys, and humans only