It was just another day on the beach for holidaymakers off the coast of Rio de Janeiro, Brazil, when a pod of about 30 dolphins swam ashore on Monday. Beachgoers quickly came to the rescue, rushing into the sea and dragging the dolphins by their fins and tails into deeper water.
The whole episode was captured by Gerd Traue in a video (above), which has racked up over a million views online.
What can experts learn from the footage? The species involved, for one. These are common dolphins (Delphinus delphis), which typically live a long way off shore, says Mark Simmonds of the Whale and Dolphin Conservation Society, a global charity.
However the video does not reveal what caused the stranding – fishing boats or sonar are two possibilities.
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