When the helper isnt related

In some species, the male bird that helps out the mother bird isn't one of her sons or related to her at all. How can helping a complete stranger make more offspring be selectively advantageous?

In these species, mortality can be quite high. If the breeding male dies while the unrelated male is hanging around being oh-so-helpful, who do you think the female will turn to as a new mate? You've got it: Mr. Helpful himself, who, by assisting her, has given himself the inside track on the job!

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