Baby Echidna, Taronga Zoo, Sydney, New South Wales, Australia

- Western long-beaked echidna (Z. bruijni), of the highland forests;
- Sir David's long-beaked echidna (Z. attenboroughi), described in 1961 and preferring a still higher habitat;
- Eastern long-beaked echidna (Z. bartoni), of which four distinct subspecies have been identified.