California, Nov 9 (THAINDIAN NEWS) Marine biologists have finally figured out why there has been an increase in porpoise’s deaths in the last few years on California beaches. The reason they say is surprisingly dolphin attacks.

The conservation group Okeanis shot a video, which showcased bottlenose dolphins attacking a porpoise and injuring it fatally. ‘It showed male dolphins chasing the porpoise, ramming it and drowning it, then bringing the carcass to researchers on a boat and swimming away’, according to the Santa Cruz Sentinel.

The video helps explain why porpoise carcasses are found on the Californian beaches with internal bleeding, rake marks and multiple broken bones. Scientists say about 74 dead porpoises washed up last year in the state.

Biologists at the Moss Landing-based group are working in correlation with the other scientists at Santa Barbara Museum of Natural History, Marine Mammal Center and other groups to find more evidence of this amazing discovery.