Most oarfish seen by humans are dead or dying on a beach. But a new video captured in March in Mexico's Sea of Cortés shows two 15-foot-long oarfish--aka Regalecus glesne--gliding about in shallow water near the shore.
Oarfish are known for their lengthy dorsal fin, which they undulate to move about. They can also contort their whole body in a sinusoidal pattern for fast swimming. Their large size and swimming behavior has led historians to think oarfish might be the source of many "sea serpent" sightings in the past.