A mysterious pulsating hum has been keeping people in the British town of Hythe awake at night, and scientists say there's definitely something fishy about it.
Residents have complained to the local council, saying they've had to leave the area just to sleep. Some people have even gone to the doctor, suspecting they had tinnitus.
Blame has been placed on everything from industrial noise to passing cargo ships, but the Scottish Association for Marine Science thinks it's found the answer: male midshipman fish.
With some help from a robotic fish, scientists have discovered that zebrafish are much like humans in at least one way – they get reckless when they get drunk. OK, "drunk" might not be technically accurate, but when exposed to alcohol, the fish show no fear of a robotic version of one of their natural predators, the Indian leaf fish. When they're "sober," they avoid the thing like crazy.
Soares and her colleagues used high-speed cameras to film a group of nine male guppies from the island of Trinidad. Their research, published online April 16 in the journal PLOS ONE, suggests wild guppies use their curious jumping ability as a way to spread the species away from an original habitat, to a new place with fewer predators. In other words, jumping likely serves a crucial evolutionary function for guppies.