New research shows sea turtles, penguins and whales swim at optimal depths to minimise the energetic cost of travel.

However, when you buy something through our retail links, Condé Nast may earn an affiliate commission.In De Elizabeth's upcoming dark fantasy YA novel This Raging Sea, 18-year-old Briar Winters seems ...

Often dubbed the unicorns of the sea, narwhals are strange and beautiful creatures with long tusks protruding from their heads. Members of the population of more than 80,000 can weigh up to 4,200 ...