They believe he is a male, 30 years of age or older, who may be considered by others to be odd or eccentric.
Tinbergen started the fashion for using sticklebacks to study mating strategies by showing that the red belly which a male develops when he is ready to breed is a badge that promotes aggression in fellow males, while signalling to females that he is available to court them.
"The decision here is not based on the conclusion that this case involves a same-sex marriage merely because one of the parties is a transsexual male, " he wrote.
Their reasons for doing so seem to be that the depth of the colour is a good indicator of how free a male is of parasitic infection, and thus how good a father he will make.
Derek Manford, the chairman, is himself a reformed male chauvinist: he opposed the equal-rights motion nine years ago (to his wife's displeasure), but says that the women have proved their worth by organising raffles, bingo and barbecues.
And the more desirable (and therefore the more courted) a male is himself, the choosier he can afford to be.
"It measured 2.15m which is big and it was a male, " he said.
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He is the first openly gay male to be elected to Congress as a freshman.
He says Casual Male is working hard to get in shape and is a big believer in management.
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If he is content to cede the alpha male role to Ellison, always a prerequisite at Oracle, he ought to do fine.
Too often when an individual with a high profile gets into difficulty he (and it is often male) apologizes without offering to make amends.
In species where the only thing that a male contributes to his offspring is his sperm, he is usually, as theory predicts, more or less indiscriminate in his courting.
Liquorice, who is actually a young male grey seal, was weak and very thin when he was found by a member of the public.
"However if the body, when it's developing, is not guided into turning into a male, then it will always be female, " he told CNN.
Unless he uses the convention to persuade white male voters that he is, as they say of his running mate, Joe Lieberman, a mensch -- and, since Gore is top man, even more of a mensch than Lieberman -- then his chances in November start to get dim.
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