These delightful calls have earned belugas the nickname “canaries of the sea ... whales, such as orcas and blue whales, belugas have no dorsal fin. Instead, they have a low ridge where the dorsal fin ...

MARTIN: What do penguins, sea turtles and whales have in ... dragging frozen carcasses through the water to measure the drag forces and how they changed at different depths. So this kind of sweet spot ...

You have to contend with choppy water, and the physical act of swimming ... sea turtles and whales have to come up for air. Theoretically, there should be a sweet spot for swimmers - deep enough ...