More head(s)
With respect to the choice between singular and plural in phrases like "ostriches when frightened bury their head(s) in the sand", Richard A. Posner wrote:
I don't think there's actually a rule, in English at any rate, or at least a simple either-or rule, to govern the choice between the singular and the plural. The choice depends on the mental picture that it evokes. That in turn depends on whether the subject of the sentence, though plural, is viewed aggregatively or distributively. The "virgins of Jerusalem hang down their heads" sounds fine, but so does "In prosperous days They swarm, but in adverse withdraw their head." The difference is that the virgins are acting collectively, in unison; the swarmers are not–nor are the ostriches when they bury their heads. Each ostrich does that separately, individually. So the reader thinks of an individual ostrich, and he (or she) has one head. But the virgins are thought of as moving their heads in unison–a bunch of heads moving at once.
This is an interesting analysis, but as a description of general usage, I don't believe that it's accurate.
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