Whales are large marine mammals found in oceans worldwide, with a diverse range of species, including baleen whales and toothed whales. They vary greatly in size, from the massive blue whale, the largest animal ever known, to smaller species like the dwarf sperm whale. Whales are known for their intelligence, complex social structures, and long migrations. Baleen whales, such as humpbacks, feed on small organisms like krill, while toothed whales, like orcas and sperm whales, hunt fish, squid, and even larger prey. They communicate using sophisticated vocalizations, and many species are known for their acrobatic displays and deep dives.