Assertion: echidna | /r/CapableOf | form the group of monotremes
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text: Echidna and its relative, the platypus, form the group of monotremes, the most primitive mammals still living, and displaying many archaic traits inherited from mammals' reptile ancestor like this cloaca (just like in birds and reptiles), egg laying, weak ability to maintain constant body temperature (which is anyhow lower than in other mammals, at about 32o C, compared to 37o C in humans), tiny brain and many bone characteristics (especially in the ear, jaw and shoulder).