Whales
Largest animals on Earth, divided into baleen and toothed whales.
Seals
Marine mammals with flippers, found in cold and warm waters.
Fish
Diverse vertebrates with gills and fins, living in varied habitats.
Dolphins
Intelligent social mammals using echolocation.
Sharks
Cartilaginous apex predators found in all oceans.
Seahorses
Unique fish with horse-like heads and prehensile tails.