Abstract
The author refers to a paper by Coney and Mackey entitled `Weinbergs Rule versus facultative sex ratio...and argues that the number of mechanisms underlying variations in mammalian sex ratio at birth (e.g. steroid hormone levels) is presumably much smaller than the number of variables by which it varies. He suggests that research strategy would dictate investigating whether these underlying mechanisms (rather than the ad hoc variables) operate in conformity with facultative theory. (EXCERPT)
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