Which of the following is NOT an aquatic organism?

The eagle is the organism that does not belong to the aquatic category. Eagles are birds of prey that primarily inhabit terrestrial environments, such as forests, mountains, and open areas, where they hunt for food. While some eagles may be found near water bodies and can hunt fish or other aquatic creatures, they do not live in water nor do they possess the adaptations that define aquatic organisms.

In contrast, fish, frogs, and crabs are all intricately linked to aquatic environments. Fish are fully adapted to life in water, possessing gills for breathing and fins for swimming. Frogs have a life cycle that begins in water with aquatic tadpoles before transitioning to a more terrestrial adult form; however, they still require water for reproduction. Crabs are also primarily marine animals, living in saltwater habitats or sometimes in freshwater environments, and are well adapted to life in an aquatic ecosystem.