How big they are: From 5 to 32 feet (1.5 to 10 meters) long, depending on the species Dolphins live in almost every ocean, except most tend to avoid the cold waters in the Arctic and around Antarctica ...

Scientists have discovered that once a mammal has become fully aquatic, it passes a threshold that makes a return to terrestrial landscapes almost impossible. When you purchase through links on our ...

Dr. Debra Moore, an assistant clinical professor in MSU’s College of Veterinary Medicine, evaluates a sea turtle as part of university efforts to monitor the health of marine mammals and sea turtles ...

Manatees weigh 880 to 1,210 pounds and average 9 feet 2 inches to 9 feet 10 inches in length. They can grow up to 15 feet and weigh up to 3,900 pounds. Females tend to be larger and heavier than males ...

An analysis of the interior of a single bone suggests its owner was probably an aquatic or semi-aquatic animal. Since the bone has been proposed to come from an ancestor of echidnas, or at least a ...

Sea otters are North America’s smallest marine mammal, weighing just 30 to 100 pounds, but their appetites are huge. They burn calories at three times the rate expected for their size, chomping on ...

Amid the growing call for reducing the use of plastics, the environmental group Oceana has issued the first ever compilation of the material’s gruesome impact on sea turtles and marine mammals in U.S.

The Haenyeo women who dive deep into the East China Sea to harvest sea urchins and shellfish spend the most time underwater of any humans ever studied — one to five hours a day, researchers report ...

Their fur is so soft it almost led to their extinction, but otters’ recovery has been a boon to Pacific kelp forests, a key habitat for other sealife Sea otters use their agile, grippy forepaws to ...