¿Qué es un mamífero?: diferentes tipos de mamíferos

The video tutorial explores the diversity of mammals, highlighting three main groups: Monotremes, Marsupials, and Placental mammals. Monotremes, like echidnas and platypuses, are unique for laying eggs. Marsupials, such as kangaroos and opossums, give birth to underdeveloped young that mature in a pouch. Placental mammals, the largest group, develop inside the mother's body with the help of a placenta. This group includes familiar animals like cats, dogs, and humans. The video also discusses subgroups of placental mammals, including hoofed animals, rodents, and carnivores.

What role does the placenta play in the development of placental mammals?

List some examples of hoofed animals and explain their common features.