Marsupials, monotremes and placental mammals are all sub-groups of mammals. They share the following characteristics:
The major differences, however, include:
Monotremes, marsupials, and placentals
Because placentals are the largest number of mammals.
Marsupials, monotremes, and placentals are all types of mammals. To qualify as a mammal, an animal has to be warm blooded, have hair, and produce milk for its young. Alligators do not fit any of those criteria, because they are reptiles, not mammals. So they are not marsupials, monotremes, or placentals.
No. Mammals which lay eggs are monotremes. Placental mammals and marsupials give live birth.
Yes. Dolphins are placental mammals because they do not have a pouch like most marsupials, and they do not lay eggs like the monotremes.
Theria is the closest connection between marsupials and placentals. It includes all mammals besides the monotremes.
yes all mammals are placental. No, not all animals are placentals. There are also marsupials and monotremes.
Yes. The fact that these animals feed their young on mothers' milk is one of the defining characteristics of all mammals, including the placentals, marsupials and monotremes.
Bats are placental mammals. Unlike monotremes, they do not lay eggs.
Monotremes, marsupials, and placental mammals.
Monotremes and marsupials are both types of mammals along with placental mammals
The majority of the world's marsupials and monotremes are found on the continent of Australia.