There's no collective term for a group of echidnas.
If you mean genus, e.g. Canines, Felines, etc., then platapusses and echidnas are marsupials
Yes, echidnas are a type of mammal called monotremes, which means a mammal that lays eggs.
Echidnas do not hibernate.
No. Echidnas do not hop. They walk.
There are no echidnas in Bali. Echidnas are found only in Australia and on the island of New Guinea.
No. All echidnas are mammals, and all mammals are vertebrates. Echidnas are different from "echinoderms".
No. Echidnas eat termites.
No. The echidna is sometimes called a spiny anteater, but it bears no relation to anteaters. Anteaters are placental mammals, and echidnas are monotremes (egg-laying mammals).
Yes. Echidnas are solitary animals.
Echidnas do not hibernate.
Echidnas do not hibernate.