Where do placental mammals live?

Answer 1

Placental mammals are mammals that give birth to fully developed live young, such as like humans, for instance. They are classed within the group of animals known as eutherians.

Dogs, cats, livestock, rodents, giraffes, rhinoceroses, etc, are all placental mammals.

This is opposed to the monotremes, which are egg-laying mammals (platypuses and echidnas) or marsupials (kangaroos, koalas, wombats, etc), which give birth to very undeveloped young that must complete their development attached to a nutrient-supplying teat, usually in the mother's pouch.

Answer 2

Most placental animals consist of most mammals, because after birth, the placenta exits the mammal, and it is common for horses to have to go to the ER because some pieces of the placenta may still be inside of the animal. The reason for this is that after birth, the placenta "dies" because it has nothing to nourish anymore. On rare occasions do fish have placentas. The only fish that do are the many kinds of whale, dolphins, and sting rays.

Answer 3

Humans are placental mammals because our young grow in a placenta inside the mother. The earliest kind of mammal did not do this, some lay eggs (Echidna, Platypus), some give birth to a heavily underdeveloped infant, which immediately crawls into a pouch for further growth.

Answer 4

Placental mammals all have live young, which are nourished before birth in the mother's uterus through an embryonic organ attached to the uterus wall, the placenta. This is ejected shortly after birth.

Answer 5

With the introduction of placental mammals, like rats and dingoes, to Australasia, non-human placental mammals occupy every area of the earth except the interior of Antarctica.

Answer 6

All mammals except monotremes and marsupials are placental.