Research into the attacks, which took place in the Baltic Sea over three months in 2016, is still ongoing.
The male came back for three months in 2016 and, during this time, six harbor porpoises washed up dead with varying degrees of trauma inflicted to their bodies—unusual events for the region. The dolphin was recognizable through"eyelash-like scars" around his left eye and scars on the side of his blowhole.
Gross said they do not know why the solitary male arrived in the German Baltic, saying it may relate to range expansion or exploring new feeding grounds. Based on analysis of previous attacks, the team say there are a number of different possibilities as to why dolphins are killing porpoises. These include territorial disputes, food competition, interference with feeding and defense of group members.
Both male and female dolphins are known to kill their young. In the study, the researchers say they may be using the porpoises, which are smaller than the dolphins, to"hone their skills for infanticide."
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