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 that filter small fish and plankton from the water. This allows them to consume large amounts of food efficiently while swimming through the ocean. There are several species of baleen whales, including the blue whale, the largest animal on Earth, and the humpback whale, famous for its acrobatic breaches. These whales are typically found in oceans worldwide and play a crucial role in marine ecosystems by helping to maintain the balance of ocean life.