Abstract
Adult and juvenile Dasycercus cristicauda and Dasyuroides byrnei were observed in captivity during a 10-month period. Animals were housed as social groups. Observations were made through a one-way glass window. Basic variables of investigative, ingestive, eliminative, aggressive, sexual, and maternal behavior were recorded. Individuals of D. cristicauda and D. byrnei were active day and night. Both species preferred freshly-killed or frozen mice to other foods. Aggression between conspecifics was minimal. Sexual behavior was seldom observed among specimens of D. byrnei, whereas individuals of D. cristicauda were noted to copulate on five occasions. One litter of each species was born and reared in captivity.
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