Marine mammals, fish, sea turtles, and birds can be injured or killed from entanglement with plastics and other solid waste that may be released or disposed off of cruise ships.
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Marine mammals, such a whales and manatees, risk being struck by ships, causing injury and death.
Professor Walløe is the scientific adviser to the Norwegian Government on Marine mammals.
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Philip Demers (aka "The Walrus Whisperer") (born March 21, 1978 in Welland, Ontario) was a professional marine mammal trainer at MarineLand in Niagara Falls, Ontario.
That they went extinct at the same time as the giant penguins of the Southern Hemisphere, which also coincided with the radiation of the seals and dolphins, has led to speculation that the expansion of marine mammals was responsible for the extinction of the Plotopteridae.
It is now most popularly imagined as an unknown type of marine mammal, sharing traits with a seal or walrus.
Two submarines of the United States Navy have been named USS Seal for the seal, a marine mammal.