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mammal mystery

Okay, I got email from a kidlet asking why prehistoric mammals were so
small when so many dinosaurs were gigantic.  I'm assuming we can stick
to Mesozoic mammals like Haramiya and Alphadon on this one.  But
frankly, I don't have a clue why mammals remained relatively small in
comparison to dinosaurs.  Do you?  Any suggestions as to how I should
answer young lad?