杏吧原创

FEMALE weevils pretend to be heterosexual couples by mounting each other in
order to attract large males.

Male Diaprepes abbreviatus weevils aren鈥檛 very good at
distinguishing females from males, so they often approach copulating couples, as
one of the amorous pair will be female. But Ally Harari and Jane Brockman of the
University of Florida in Gainesville found that only larger males approach
copulating couples, as they are more likely to win the female from her existing
partner (Nature, vol 401, p 762).

So by pretending to be a copulating pair, female weevils attract better
quality mates. 鈥淭hey do it in order to attract the larger males鈥攖he
smaller males can鈥檛 compete,鈥� says Harari.