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Bugger the penguins, it's the sheep we have to worry about.
Source
Source
The team's probing of the workings of the minds of these furry Friends of Dorothy indicate that they have smaller ovine sexually dimorphic nuclei (oSDNs) than their straight counterparts.
These nerve cells are found in the hypothalamus, which is - among other things - responsible for sexual behaviour. Apparently, rams who prefer the company of ladies have larger oSDNs packed with more neurons.
Team leader professor Charles Roselli said: "This particular study, along with others, strongly suggests that sexual preference is biologically determined in animals, and possibly in humans.