In primates, that is.
http://www.cosmosmagazine.com/news/3914/dry-years-produce-more-females
What this correlates to is studies done that indicate that primate females will reject male fetuses if their bodies are given signals indicating that there is a time of scarcity.
The primate female *that* study was done with...was homo sapiens.
(The study, in fact, revealed that dieting and skipping breakfast, rather than environmental estrogens, is the cause of the slight skew towards more girls being born in post-industrial societies).
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