No. Hamsters are placental mammals. Most marsupials (not all) are characterised by a pouch or marsupium, which the hamster does not have.
No. They're mammals, like you & me. Guinea Pigs have spines, which makes them vertebrates, not invertebrates.
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.
placental mammals are the most famous mammals
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.
These creatures are all mammals. Baboons, orangutans and hamsters are all placental mammals while koalas and opossums are marsupials. Therefore, the young of koalas and opossums are called joeys.
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.