In the icy waters surrounding Antarctica, small shrimp-like crustaceans called krill (Euphausia superba) swim in swarms of trillions, forming a biomass larger than the entire

Orcas, or killer whales, are the apex predator in the ocean when they work together. A new study documents how a pod of orcas is

Surangel S. Whipps Jr., president of the tiny Pacific island nation of Palau, wants more countries to join him in calling for a moratorium on

Swimming with giant manta rays (Mobula birostris) feels like an underwater dance. Their slow, rhythmic movements are astonishing to Madalena Pereira Cabral. She describes her