As the sun rises over the island of American Samoa, a chorus of animal voices drifts upward. They're not the calls of birds, though -- the purrs, clicks and groans are coming from under the water. New research shows how automation can make it increasingly easy to eavesdrop on the fish making the sounds and uncover how their environment impacts them. Jill Munger first heard about fish that make sounds while she was an undergraduate student. A veteran researcher told her about marine acoustics.

This is an Inside Science story. As the sun rises over the island of American Samoa, a chorus of animal voices drifts upward. They're not the calls of birds, though -- the purrs, clicks and groans are coming from under the water. New research shows how automation can make it increasingly easy to eavesdrop on the fish making the sounds and uncover how their environment impacts them. Jill Munger first heard about fish that make sounds while she was an undergraduate student.

A cosmic jellyfish floats through the sea in a new video from an underwater robotic craft tasked with exploring the deep ocean off the coast of American Samoa and Samoa. The Okeanos Explorer ship -- operated by the National Oceanic and Atmospheric Administration (NOAA) -- caught sight of the jellyfish on Feb. 21 during a dive in the Utu seamount, a previously unexplored area, according to the agency. The researchers who caught sight of the jellyfish noted that it has two sets of tentacles and the yellow glowing structures dotting the outside of the jelly appear to be reproductive organs, with its red digestive system in the middle. "It's a really beautiful jellyfish," one of the scientists said on a NOAA website. The jellyfish wasn't the only creature seen during the dive deep into Utu.