他可是能告诉我们一个人有没有足够的气力去养育后代。
A big fat clue to whether the person will have enough energy to care for offspring.
在一些物种中，祖父母也在自己的繁殖期结束后帮助自己的后代养育子女。
In some species, grandparents also assist their offspring when their own breeding time is over.
在一些物种中，祖父母也在自己的繁殖期结束后帮助自己的后代养育子女。
In some species, grandparents also assist their offspring when their own breeding time is over.
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