Skewed Sex Ratios

What factors could skew the sex ratio of an intelligent species, especially a humanoid/human sub-race? For example, say one race has markedly more females born than males, and another race has the opposite, many more males than females. The race is unimportant, whether elves and dwarves, nymphs and goblins, respectively, etc.

What would lead to such scenario when births of one sex are so much more common than births of the other, assuming the parents aren't deliberately altering the ratio somehow?

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Skewed Sex Ratios

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