- Are generally larger than toothed whales. The largest animal in the world, the blue whale, is a baleen whale.
- Feed on smaller fish and plankton with a filtering system made up of hundreds of baleen plates.
- Tend to be solitary, although they occasionally gather in groups to feed or to travel.
- Have two blowholes on top of their head, one right next to the other.
Female baleen whales are also larger than males of the same species.
- Are generally smaller than baleen whales, although there are some exceptions (e.g., the sperm whale and Baird's beaked whale). The toothed whales include all species of dolphins and porpoises.
- Are active predators and have teeth that they use to catch their prey and swallow it whole. The prey varies depending on species, but can include fish, seals, sea lions or even other whales.
- Have a much stronger social structure than baleen whales, often gathering in pods with a stable social structure.
- Have one blowhole on top of their head.
Unlike baleen whales, males of toothed whales species are usually larger than females.