Baleen whales are a group of large marine mammals known for their unique feeding system. Instead of teeth, they have baleen plates made of keratin, which they use to filter small fish and plankton from the water. These gentle giants can be found in oceans around the world, and they include species like the blue whale and humpback whale. These whales are known for their impressive size, with some, like the blue whale, being the largest animals on Earth. Baleen whales are also famous for their songs, especially the humpback whale, which produces complex melodies that can travel long distances underwater.