But about 15 years ago, we knew virtually nothing of the diving behaviour of marine mammals.
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In this context, harvesting of the more abundant marine mammals takes on a real economic significance.
An estimated 100, 000 marine mammals are killed each year by plastic in the ocean.
The elusive marine mammals inhabit the Southern Hemisphere and have only been spotted at sea a few dozen times.
To date, most research has focused on the impact sound might have on marine mammals, such as whales and dolphins.
Every year thousands of birds, seals, dolphins and marine mammals die by swallowing or becoming entangled in rubbish, the organisation said.
Shipping noise has similarly increased, according to recent reviews of the effects that artificial noise has on marine mammals such as whales.
Along with dolphins, they are the only marine mammals to use tools.
If marine mammals are turning up on beaches or dying in nets, then these events should be warning flags for the whole ecosystem.
The spill exterminated a quarter-million seabirds and thousands of marine mammals.
Remember, with respect to birds, or fish, or marine mammals, or many insects, even amphibians and reptiles, for example: they do not acknowledge arbitrary human boundaries.
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Two parasites, one carried by cats and the other by opossums, are teaming up in the Pacific Northwest to kill seals, otters and other marine mammals.
Relatively little data existed on health problems in marine mammals in the 1960s, and Dr. Kenney pioneered basic health care for many of the animals he treated.
The HAUV was less successful at carrying out its task when working in strong or complex currents of the sort that trained marine mammals would simply ignore.
The International Whaling Commission said in July there was "compelling evidence" that entire populations of marine mammals were at potential risk from increasingly intense man-made underwater noise.
BBC: NEWS | Science/Nature | The deafening sound of the seas
The other parasite, Sarcocystis neurona, was a surprising find in the tissues of dead marine mammals, researchers reported Tuesday in the open-access journal PLoS Neglected Tropical Diseases.
The site is globally important for threatened seabirds and migratory birds, a number of salmonid species, and for marine mammals including Steller's sea lion and some cetacean species.
The new air base would be built on reclaimed land there, where sea turtles and marine mammals called dugongs now swim around coral reefs in turquoise blue waters.
In 2010, that protection was extended to all marine mammals.
Grigg and his colleagues performed necropsies on 151 dead marine mammals that they suspected had parasitic encephalitis, the medical term for the brain swelling caused by parasite infection.
For many, however, this is a hot topic as some have suggested a direct connection between the presence of domestic cats and toxo-related infections in other animals, primarily land and marine mammals.
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In the North Atlantic, the harvesting of all marine mammals has been at very low levels for more than three decades, a consequence of irresponsible behaviour by a number of environmental groups.
Plastics affect our health and the lives of the estimated 1 million seabirds, 100, 000 marine mammals and sea turtles that die every year when they entangle themselves in marine debris or ingest it.
But basically it really calls on human physiology, there's nothing that's unique to me - everything, you know, that I call on as a free diver is really unique to the human race and our connection with marine mammals.
According to the Northwest Marine Conservation Initiative, the nets are responsible for killing tens of thousands of marine life, mammals and birds every year.
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