Here's a breakdown:
* Whales: These are the largest members of the order, divided into two suborders:
* Baleen whales: These whales have baleen plates instead of teeth and filter krill and other small organisms from the water. Examples include humpback whales, blue whales, and gray whales.
* Toothed whales: These whales have teeth and hunt a variety of prey, including fish, squid, and other marine mammals. Examples include sperm whales, orcas, and dolphins.
* Dolphins: These are smaller toothed whales with a streamlined body and a beak-like snout. There are over 40 species of dolphins, including the common dolphin, bottlenose dolphin, and river dolphins.
* Porpoises: These are smaller toothed whales with a blunt head and a triangular dorsal fin. They are often mistaken for dolphins, but they have a more robust body shape and a smaller, more rounded dorsal fin. Examples include the harbor porpoise and the Dall's porpoise.