Video 1: Placental Mammals (3:46)

Video 2: Monotremes: Baby Platypuses Hatching (3:33)

Video 3: Monotremes: Probing Platypus Evolution (5:19)

Video 4: Marsupials: Newborn Baby Grey Kangaroo (3:16)

Video 5: New Human Ancestor Discovered: Homo naledi (3:31)

Figure 1: Marsupial and Monotreme Mammals

Figure 2a: Categories of Placental Mammals

Figure 2b: Categories of Placental Mammals (continued)