Seahorses growl when they're stressed

Seahorses are known to produce sounds depending on their mood, but now a new study has revealed that they can also growl in stressful situations.

Scientists examined the acoustic behaviour of Long-snouted seahorses (Hippocampus reidi) by analysing sound production. They found that they made clicking sounds during reproductive behaviour and when feeding, but that they also produced previously undescribed growling noises when they were under stress, such as when being handled. The growling was accompanied by vibration of the seahorses' bodies and it's thought that the reaction may be an escape mechanism produced to startle predators.

The research was published in the Journal of Zoology.

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