I wonder why.
There are bird species in which males provide most parental care but no mammals: M Daly, Killing the Competition, p. 42.
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Next you are going to say female mammals have breast for a specific reason. Hogwash! Everything is equal :)
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Birds has an inverse sex-chromosome system: XX (male) vs XY (female). Y chrom. is evolutionary one-way (no shuffle). Leads to risk taking...
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... as a way to eliminate unwanted traits. X chromosomes shuffle and don't need the same extreme elimination mechanism.
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I'm not sure if this is biologically accurate
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