If you've ever seen a dolphin swim, you may have wondered why they undulate their bodies up and down when swimming, instead of side to side as fishes do. Though they have a fishlike body, cetaceans (a ...

Prehistoric dolphins acted more like modern-day killer whales, according to a newly published study. The research, which appears in the scientific journal Current Biology, describes a 25-million ...

From its skeletal structure, scientists have determined it had similar postcranial features -- the bones of the creature's body -- to modern whales, implying that similar aquatic habitats led to ...

A report offers a detailed description of the first nearly complete skeleton of an extinct large dolphin, discovered in what is now South Carolina. The 15-foot-long dolphin (Ankylorhiza tiedemani ...