Twenty-one dolphins that were apparently attacked by another species of dolphin have died after washing up on a beach in northern Mexico, authorities said.

Environmental activists launched a frantic operation to try to save the dolphins after a group of 54 washed up on a rocky beach in Bahia de la Paz, in Mexico's Baja California peninsula.

They managed to get 33 of the short-beaked common dolphins back in the water alive, but the rest died on the beach, the Mexican environmental protection authority, Profepa, said in a statement.

The dolphins had bite marks that appeared to indicate they had been attacked by bottlenose dolphins, rescuers said.

Despite their cute and friendly reputation, some dolphins, including the bottlenose, are known to attack and even kill other dolphins.

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Scientists gain insights into the secretive lives of narwhals
Washington (UPI) Feb 12, 2018
The lives of narwhals have remained mostly a mystery to scientists. But new research is beginning to offer insights into the behaviors and movement patterns of the elusive toothed whales. Narwhals are known for their long tusk. But because they spend much of their lives at significant depths, they're difficult to study. The new insights were made possible by data collected from 15 narwhals tagged with satellite tracking devices. For several years, scientists at the University of Washingt ... read more