How are otters and dolphins the same?

Otters and dolphins are both aquatic mammals that belong to the order Carnivora and Cetacea, respectively, and they share similar adaptations for life in water, such as streamlined bodies and the ability to hold their breath underwater. Both species are known for their playful behavior, demonstrating high intelligence and social interactions within their groups. Additionally, they possess thick layers of insulation—fur in otters and blubber in dolphins—to maintain body temperature in their aquatic environments.