Black-and-white cetaceans are a type of marine mammal that includes orcas, also known as killer whales. Orcas are the largest member of the dolphin family and are easily recognizable by their distinctive black and white markings. They are highly intelligent and social animals, living in large pods and communicating with each other through a complex system of clicks and whistles. Orcas are found in all oceans around the world and are apex predators, meaning they are at the top of the food chain.