Relative brain size (brain weight/total body weight)tends to be larger in the monotremes than in either the marsupials or the eutherians.

Name: Relative brain size (brain weight/total body weight)tends to be larger in the monotremes than in either the marsupials or the eutherians.
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Monotremes generally have smaller relative brain sizes compared to marsupials and eutherians. Eutherians, in particular, tend to have larger brains relative to their body size.

Relative Brain Size (Brain Weight/total Body Weight)tends to Be Larger