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The researchers warned that this hectic lifestyle meant that the porpoises were particularly vulnerable to noise from ships and marine industries that interferes with their echolocation calls, which they use to track and catch their prey.
Dr Danuta Wisniewska, of Aarhus University in Denmark, said: “Our results show that porpoises hunt small fish, typically less than five centimetres, nearly continuously day and night at ultra-high rates, attempting to capture up to 550 fish per hour, and frequently more than ten per minute.
According to the Hedridean Whale and Dolphin Trust, they are normally seen “only briefly, when they surface to breathe”.
“This is the first time we have been able to measure simultaneously how a marine mammal hunts and how often it is successful,” Dr Wisniewska said.Báthory, who became known as the "Blood Countess", would be imprisoned in 1609.In Romania during the 1920s and 1930s, Vera Renczi's fears of infidelity and abandonment ostensibly caused her to murder the men in her life.Harbour porpoises are among the most skilled hunters in the animal kingdom, capable of catching more than nine fish a minute, scientists who tracked animals in the wild have discovered.And, because they live in such cold water, they need to eat almost constantly just to generate enough energy to stay alive.