The Musky Rat-kangaroo, Hypsiprymnodon moschatus, is described. Its present distribution and habitat are defined. An account is given of its diet and of its feeding, grooming, locomotory, nest-building, courtship and social behaviour. Earlier reports that two young may be reared simultaneously are confirmed. Attention is drawn to a number of unspecialised characters including the distribution of vibrissae, limb proportions, structure of the...