Scientists recently discovered something about male mice that's utterly bananas: The distinctive scent of a banana stresses them out.
Researchers from McGill University in Montreal, Quebec, learned about this unusual fruit aversion while analyzing spiking stress hormones in male mice when the males were close to pregnant or lactating females.The scientists reported in a new study that the males' hormonal shifts were triggered by the presence of a compound called n-pentyl acetate in the females' urine.
"Rodents and a lot of mammals other than humans are reliant on their olfactory senses," or sense of smell, Mogil said."Urine scent-marking is well known, but what we've found here is a new message that has never been described before in mammals. We've seen a lot of olfactory messages being sent from males to females, but there are fewer examples of females sending them to males.
The presence of the scent measurably increased the stress levels of the males – just like the urine had done in prior experiments – and the researchers suspect that this hormonal spike directly relates to the stress one feels when facing a possible fight.
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