Aún no tenemos significados para "male mammals".
1All male mammals are known to have these cells, but a long-held dogma said that females did not.
2By contrast, barely 1 percent of male mammals or primates demonstrate even the slightest inclination to assist with parenting.
3One reason male mammals haven't developed the ability may be that only 5 percent of mammal fathers participate in parenting.
4Similar cases have been often observed in recent years, even among other male mammals (such as sheep and goats).
5A similar, but still stronger, argument may be based upon the existence of teats, and even functional mammary glands, in male mammals.
6In addition, the male mammals excrete a higher quantity of protein than do the females., suggesting the role of androgens in excretion of protein.
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