There are no animals that match this description.
It is possible that the question is supposed to refer to possums and opossums, as many people believe that possums and opossums are both the same animal, or at least similar. This is quite incorrect, however.
The "possum" of North America is just a shorter name for an opossum, but true Australian possums are different from opossums, and not related at all, except by virtue of both animals being marsupials.
There is no animal in the US similar to the echidna. The echidna is a monotreme, and monotremes are found only on the continent of Australia, while one species of echidna is found in New Guinea.
How many species of plants are in the continent of Australia
Yes. Australia is the only continent where platypuses and wombats are found in the wild. There is one species of platypus, which is found in the eastern half of the continent, and three different species of wombats, which are found in the east and south.
Australia
The remote island continent of Australia has kept its distinct species from spreading naturally worldwide.
Australia has well over 130 species of marsupials. The many species of kangaroos alone constitute around 70 of the marsupial species.
There are about 400 species of cockroaches in Australia, most of which are native to the continent. see the related link below for more information.
There are several butterfly species that migrate between Europe, Asia, and Africa.
Most species of marsupial are found in Australia (there are at least 60 species of kangaroos alone in Australia), but it is not the only continent where they are found. Some species of marsupials are found in New Guinea, some islands of Indonesia, and many more are found in Central and South America. There is also one species of marsupial, the Opossum, in North America. Brushtail Possums and wallabies have also been introduced to New Zealand, but they are not native to the islands.
The species probably evolved under similar circumstances and they become more similar as a result. Additionally, they can become more competitive with one another.
The spiny anteater, more correctly known as the echidna, originated on the Australian continent. Both species are found on Australia's nearest neighbour, the island of New Guinea, but only the short-beaked echidna is found in Australia itself.
Most species of kangaroos are native to Australia. The tree-kangaroos, however, are found in Australia and on the island of New Guinea, as well as a few Indonesian islands.