How does the size of a quoll’s brain compare with that of a similarly sized placental cat?

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Red kangaroo (Macropus rufus) — marsupial Red kangaroo (*Macropus rufus*). The home range of this species spans much of Australia's interior, and it is the largest member of the family Macropodidae.

The brain of a quoll is smaller relative to its overall body size when compared to that of a similarly sized placental cat. Specifically, a quoll possesses approximately half as much brain tissue as a placental cat of a comparable skull size.1

This difference in size is part of a broader distinction between the two groups; marsupial brains are generally simpler in structure and bulk than those of placental mammals, most notably lacking a corpus callosum to connect the two cerebral hemispheres.1