churn in Business English. churnnoun [ U ] Preventing customer churn is a major concern for mobile service providers, since 20-40% of customers leave their providers in a given year. Employee churn for new hires increased by 33% for the third straight year.
For 18 months, the baby nurses while its mother is on land, or it swims underwater to suckle. When it dives, the calf closes its nose and ears to block out water. All hippos have this ability. They also have membranes that cover and protect their eyes while they are underwater.
Some aquatic mammals with flippers (e.g. sirenians, pinnipeds) are amphibious and regularly leave the water, sometimes for extended periods, and they have developed a range of locomotor behaviours on land. Sea lions can raise their bodies and even run on land using both their hind-and forelimbs. Seals, in contrast, undulate their bodies to move on land, similar to the up-and-down body motion used underwater by many aquatic mammals (dolphins, manatees). Cetacean brains are among the largest of all animals, both in absolute mass and relative to body size.