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The male bottlenose dolphin alone killed 6 port dolphins

VirtueThe motivations for the animal to slaughter are still a mystery and scientists are trying to understand the reason behind this behavior.

Bottlenose dolphins are not common in the Baltic Sea off the coast of Germany. Image: Wikipedia.

A bottle-nosed dolphin killed six port dolphins in the 2016 Baltic Sea attack. Researchers have noted that the bottlenose dolphins have been aggressive towards port dolphins since the late 1990s. Pay attention to the above behavior off the coast of Scotland, where the callus dolphins attack port dolphins, causing fractures and damage to the victim’s internal organs. The researchers also found tooth marks on the corpses of some port dolphins. Subsequently, many similar cases were recorded off Wales, California and North Carolina.

In a study published in the BMC Zoology in September 2020, a team of experts looked at events in Germany’s Baltic Sea for more than three months in the fall of 2016. This area was not inhabited by Bottlenose dolphins, so when 3 individuals, including a pair and a single male, show up in 2015 and 2016, they immediately attract a lot of attention.

The male bottlenose dolphin returned for 3 months in 2016. During this time, the bodies of 6 port dolphins were washed ashore with varying degrees of injuries. This is an unusual incident in the region. The callus dolphin is easy to identify thanks to the eyelash-shaped scar around its left eye and the scar on the side of the spray hole.

The team led by Stephanie Gross at the University of Veterinary Medicine Hannover, Germany, conducted an autopsy of dead port dolphins. They all noticed that they were all bleeding. Four of them had broken ribs and one had a broken lung. The researchers believe that heart failure is the cause of death in the majority of cases. They were sure the male bottlenose dolphin was the culprit. The autopsy results are consistent with previous reports of bottle-nosed dolphins’ attacks on port dolphins.

“Although in fact no attacks have been observed in German waters to date, our findings are the first recorded interaction between the bottlenose dolphins and port dolphins in the Baltic Sea. So, to our knowledge, this is the first report of an attack on port dolphins by a single male bottlenose dolphin, “the team said.

The team did not know why the male dolphin arrived in the Baltic waters of Germany, but speculated it might want to expand its range of activities or explore the area for food. Nor are they sure why it attacked the harbor dolphins due to the lack of witnesses and information on the entire situation.

Based on the analysis of previous attacks, the team came up with a number of different theories, including territorial scramble, competition for food, harassment at prey or defending a group member. . Nor do they rule out the possibility that the attacks were maneuvers. Dolphins often kill their young when they are disappointed with their mates. The research team speculates that the male dolphins target the smaller port dolphins to practice killing the young. Gross et al are planning to record dolphins in German waters. They hope to be able to find the bottlenose dolphin and observe its behavior, especially interacting with the port dolphins.

An Khang (Follow Newsweek)


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