The echidna's reproduction is not weird. It just so happens that the echidna, like the platypus, is a monotreme, meaning it is an egg-laying mammal.
by reproduction probably
Echidnas do not hibernate.
Echidnas are different as, like platypuses, they are egg-laying mammals. This group of vertebrates, known as the monotremes, is unique: their method of reproduction is laying eggs, yet they nurture their young on mothers' milk. Apart from producing milk to feed their young, there are other differences: they do not fit with egg-laying reptiles as echidnas are warm-blooded; nor do they fit with egg-laying birds because all birds have feathers, and echidnas, like other mammals, have hair/fur.
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.
Yes. Echidnas are solitary animals.
Echidnas do not hibernate.
Echidnas do not hibernate.
No. Echidnas are not hostile to people or other animals.
There's no collective term for a group of echidnas.