Nekton refers to the community of organisms that actively swim in the water column of aquatic environments, including both marine and freshwater ecosystems. Some examples of animals that belong to the Nekton include:

Fish:

* Many species of fish, such as tuna, salmon, sharks, and dolphins.

Marine Mammals:

* Whales, dolphins, porpoises, seals, and sea lions.

Sea Turtles:

* Various species of sea turtles.

Cephalopods:

* Squids, octopuses, and cuttlefish.

Crustaceans:

* Crabs, shrimp, and lobsters.

Jellyfish:

* Various types of jellyfish, such as lion's mane jellyfish and moon jellies.

Sea Snakes:

* Certain species of venomous snakes that have adapted to a marine environment.

Penguins:

* Although they are birds, penguins are flightless and spend most of their lives in the water, actively propelling themselves using their wings and streamlined bodies.

These are just a few examples of animals found in the Nekton; the diversity of marine and freshwater ecosystems supports an extensive array of swimming organisms that play crucial roles in their respective food webs and ecological communities.