Placental mammals are grouped into Xenartha (anteaters, sloths, and armadillos), Afrotheria (elephant shrews, tenrecs, golden moles, elephants, aardvarks, manatees, dugongs, and hyraxes), Euarchontoglires (rodents, rabbits, hares, pikas, tree shrews, colugos, and primates), and Laurasiatheria (hedgehogs, shrews, moles, solenodons, bats, whales, dolphins, porpoises, even-toed hoofed mammals, odd-toed hoofed mammals, pangolins, and carnivores). Each of these is further divided into orders, which are divided into families, which are divided into genera, which are divided into species. There are 21 orders and 132 families of placental mammals.
Yes
Terrestrial placental mammals do have fur or hair. Marine placental mammals do not.
No. Primates are a group of placental mammals, but there are many placental mammals that are not primates.
Yes. This is a feature of all mammals, and if this did not occur, the animal would not be classified as a mammal.
placental mammals are the most famous mammals
There are no placental mammals which lay eggs.The only two egg-laying mammals in existence are the platypus and the echidna, which are classed as monotremes.They are still classified as mammals because they feed their young on mothers' milk - a characteristic unique to mammals alone.
Most mammals are placental...marsupial mammals and monotremes are not placental.
Yes. Shrews are placental mammals.
A rabbit is a placental mammal.
Dolphins are placental mammals.
Seals are placental mammals, as the young complete their development within the mother's uterus, attached to a placenta. They do not have a pouch like most marsupials, and they do not lay eggs like monotremes.
Neither. Bats are placental mammals, so they neither have a pouch, nor do they lay eggs.