Imagine a creature so large that its tongue weighs as much as an elephant and its heart is the size of a bumper car. This is the blue whale, the largest animal ever known to live on Earth. Even though they live in the ocean, whales are not fish. They are mammals, which means they are warm-blooded, breathe air through lungs, and nurse their young with milk.
Scientists divide whales into two main groups: baleen whales and toothed whales. Baleen whales, like the humpback and the blue whale, do not have teeth. Instead, they have fringed plates called baleen that act like a giant sieve. They gulp huge mouthfuls of water and push it out through the baleen, trapping tiny shrimp-like creatures called krill to eat. On the other hand, toothed whales, such as orcas and sperm whales, have teeth to catch larger prey like fish and squid.
Life in the freezing ocean requires special adaptations. Whales have a thick layer of fat called blubber under their skin to keep them warm. To breathe, they must swim to the surface and exhale through blowholes on the top of their heads. This creates a misty spray that can be seen from far away. Many whales are also famous for their long-distance travels, known as migrations. They often spend summers in cold waters to feed and winters in warm waters to give birth to their calves.
Whales are very social and communicate with one another using a variety of sounds. Some species, like the humpback whale, are known for their complex songs that can last for twenty minutes and travel for miles underwater. Toothed whales use a special skill called echolocation. They send out sound waves that bounce off objects, helping them "see" their surroundings and find food in the dark depths of the sea. These magnificent giants continue to fascinate people as we learn more about their mysterious lives beneath the waves.
