1. Teeth: This seems obvious, but it's a key defining characteristic. Toothed whales have teeth of various shapes and sizes, adapted for catching and consuming different prey.
2. Echolocation: Many toothed whales use echolocation to navigate and hunt. They emit clicks and whistles that bounce off objects, creating a sonic "picture" of their surroundings.
3. Dorsal Fins: Most toothed whales have a single dorsal fin on their back, which is used for stability and maneuvering in the water. The shape and size of the dorsal fin can vary significantly between different species.