The Emotional Lives of Animals

4 The Love Of Animals

Dogs are able to detect diseases such as cancer and diabetes and warn humans of impending heart attacks and strokes. Elephants, whales, hippopotamuses, giraffes, and alligators use low-frequency sounds to communicate over long distances, often miles; and bats, dolphins, whales, frogs, and various rodents use high-frequency sounds to find food, communicate with others, and navigate. Sea lion mothers wail when watching their babies being eaten by killer whales.