Whales live in the water. They look and swim like fish but they aren't fish at all. Whales can't stay under the water all the time. They can't breathe underwater, so they come up to the surface for air from time to time. Whales make sounds, and they cmmuncate with these sounds. A whale's call can reach 188 decibels, and other whales can hear it from hundreds of kilometers away. Whales are very big animals. A blue whale's tongue is the size of an elephant, and its heart is the size of a small car. One large blue whale in the Antarctic Ocean was 30.5 meters long and weighed around 150 tons. Even a baby blue whale is big. It weighs around one ton at birth Whales are very useful animals. When they come up to breathe, they sometimes poop. Their poop becomes fod for sea animals near the surface. Whales are also useful for animals in the deep se.a The body of a dead whale falls deep down into the sea. This is a whale fall. It becomes food for many fish there.