Ever since the Puget Sound's southern-resident killer whales came under the Endangered Species Act (ESA), scientists have found out where orcas go in winter. They have also learned that these whales can differentiate a chinook from a sockeye by using sonar to detect little differences in the swim bladder of each fish.

A Florida shrimper accidentally caught glimpse of one of the incredibly odd-looking sharks, the Goblin shark, off the coast of Key West on April 9, 2014. Goblin sharks usually live at depth of 1,000 meters under water and has only been seen few times from past decade.

Initially, the structures looked like sunken ship, but they turned out to be two rare tar volcanoes, ocean floor vents spewing out asphalt. On April 24, researchers from Texas A&M University and the National Oceanic and Atmospheric Administration (NOAA) discovered the volcanoes.