Female seahorses cheat on their mate when they can no longer smell him

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Lined seahorses, one male and one female, clinging to algae

Shane Gross/naturepl.com

Monogamous female seahorses cheat on their male partners when they can’t smell them any more.

“Seahorses can express incredible loyalty and affection once a pair has bonded during the reproductive season,” says Dong Zhang at the Chinese Academy of Fishery Sciences in Shanghai.

The curvy-tailed couples usually stay together for months or years. They live within a few metres of each other and meet up at daylight for “morning greetings” that reinforce their bond – swimming in parallel, brightening their …

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