There are various types of aquatic animals that live underwater. An aquatic animal is an animal (vertebrate or invertebrate) that lives in water for most or all of its life. The term aquatic can apply to animals that live in freshwater or saltwater, while marine animals are those that live in the sea.
Names of Aquatic Animals
Marine Mammals
- Dolphin
- Whale
- Seal
- Sea Lion
- Walrus
- Orca (Killer Whale)
Fish
- Angelfish
- Angler fish
- Catfish
- Clownfish
- Codfish
- Eel
- Shark
- Seahorse
- Stingray
- Tuna
Crustaceans
- Crab
- Crayfish
- Lobster
- Prawn
- Shrimp
- Barnacle
Mollusks & Similar Sea Creatures
- Clam
- Oyster
- Scallop
- Octopus
- Squid
- Cuttlefish
- Jellyfish
- Starfish
- Coral
- Sea slug
- Sea snail
Reptiles
- Turtle
- Alligator
- Crocodile
Names of Aquatic Animals with Facts
Fish
- Fish breathe underwater using gills.
- Most fish have fins and scales that help them swim.
- Many fish sense movement through vibrations in the water.
Fish
/fɪʃ/
- The fish swam swiftly through the coral reef.
Shrimp
- Shrimp have see-through bodies and often live near the ocean floor.
- They help clean the sea by eating dead plants and animals.
- Some shrimp can snap their claws to make a loud popping sound.
Shrimp
/ʃrɪmp/
- The shrimp hid under a rock when it saw the predator.
Octopus
- Octopuses have eight arms and are highly intelligent.
- They can squeeze into tiny spaces because their bodies are soft.
- They may squirt ink to escape from predators.
Octopus
/ˈɑːktəpəs/
- The octopus changed color to blend with the ocean floor.
Dolphin
- Dolphins are mammals that breathe air through a blowhole.
- They use echolocation to find food and navigate.
- Dolphins live in groups called pods and are very social.
Dolphin
/ˈdɑːlfɪn/
- The dolphin leapt out of the water, thrilling the tourists.
Whale
- Whales are the largest animals on Earth.
- They breathe through blowholes and must come to the surface.
- Some whales travel thousands of miles to migrate.
Whale
/weɪl/
- We saw a whale spouting water in the distance.
Squid
- Squid have ten limbs and swim by jetting water through their bodies.
- They can squirt ink to escape danger.
- Some squid glow in the dark using bioluminescence.
Squid
/skwɪd/
- The squid darted away in a cloud of ink.
Clam
- Clams have two hard shells and often live buried in sand.
- They filter water to get food like plankton.
- Some clams can live for over 100 years.
Clam
/klæm/
- The clam slowly opened its shell on the seabed.
Lobster
- Lobsters have strong claws for catching prey and defending themselves.
- They live on the ocean floor in rocky burrows.
- Lobsters molt (shed their shells) as they grow.
Lobster
/ˈlɑːbstɚ/
- The lobster scurried into its cave when disturbed.
Crab
- Crabs walk sideways and have strong pincers.
- They often hide among rocks, sand, or mud.
- Some crabs use shells or objects for protection.
Crab
/kræb/
- The crab grabbed a shell and disappeared into the sand.
Clownfish
- Clownfish live in sea anemones for protection.
- They are immune to the anemone’s sting.
- Clownfish can change sex if needed in their group.
Clownfish
/ˈklaʊnˌfɪʃ/
- The clownfish peeked out from its sea anemone home.
Turtle (Sea Turtle)
- Sea turtles have flippers to help them swim.
- They return to the same beach to lay eggs.
- Sea turtles can hold their breath underwater for hours.
Turtle
/ˈtɝːtəl/
- The turtle glided peacefully through the ocean.
Penguin
- Penguins are birds that swim but cannot fly.
- They use their wings like flippers underwater.
- Many penguins live in cold areas and huddle for warmth.
Penguin
/ˈpɛŋɡwɪn/
- The penguin dove into the icy water to catch fish.
Sea Lion
- Sea lions are playful marine mammals with strong flippers.
- They can “walk” on land using their front flippers.
- Sea lions are very vocal and bark to communicate.
Sea Lion
/ˈsiː ˌlaɪən/
- The sea lion barked loudly while resting on the rock.
Orca (Killer Whale)
- Orcas are top predators in the ocean.
- They live and hunt in groups called pods.
- Orcas are highly intelligent and use coordinated hunting tactics.
Orca
/ˈɔːrkə/
- An orca breached the surface, creating a huge splash.
Last Updated on February 4, 2026
Rahul Singh