Information and Facts about Life in the Ocean

Animals That Live in the Ocean


Did you know there are over 250,000 species of animals living in the world's oceans? Scientists are discovering constantly discovering new animal species thanks to new underwater vehicles, but the vast majority of the oceans have not been fully explored!

Types of Ocean Animals


  • Ocean animals are classified into 2 distinct categories which include vertebrates and invertebrates. Animals that are vertebrates have a backbone, but invertebrates do not have a backbone.


  • All vertebrates are Chordates, which are animals with a doral nerve chord. Chordates include mammals, amphibians, reptiles, birds and fish.

Ocean Vertebrates


Vertebrates include some of the most known sea animals including fish, whales, sharks and dolphins. There are not as many vertebrates in the world's oceans as invertebrates, but you may have been lucky enough to have seen a whale or dolphin while visiting an ocean

Types of Sea Mammals


There are over 4000 different types of mammals. Find out more information about some of the mammals that live in or near the sea

  • Whales - the largest animals on Earth.

  • Dolpins - Very intelligent sea mammals

  • Porpoises - similar to the dolphin

  • Dugongs and manatees - live near the sea.

  • Seals - live near the sea in colder climates

  • Sea Otters

  • Walrus - Large land mammals that spend much or their time in the ocean.

  • Polar Bears - Even the polar bear may spend time hunting in the sea.

  • See more Mammal Facts.

Reptile that Live near the Sea


  • Although most reptiles live on dry land or spend time in freshwater, there are reptiles that live in the oceans.

  • The most well-known reptiles that live in the ocean are Sea turtles. Sea turtles can live for many years and can grow very large. In the ocean, they are able to swim effortlessly and dive very deep to find food or escape danger

  • Sea snakes live in the ocean

  • See more Reptile Facts.

Ocean Amphibian Facts


  • Even though amphibians typically live near water or wet ground, there are no known species of amphibians that live in the open ocean. There are some amphibian species, however, that have been observed to tolerate brackish saltwater on the edge of the sea.

  • See more Amphibian Facts.

types of ocean animals - whales

Whales, which are mammals, are the largest animals on Earth.

ocean animal facts - seahorse

Seahorse are a unique sea animal that spends its life in calm water near mangrove tree roots or near coral reefs.

Sea Animal information - starfish

Starfish are a type of echinoderm, which is an invertebrate.

Ocean animal facts - fish

There are many undiscovered fish in the vast oceans. Scientists discover a new type of fish about every other day.

Ocean Fish Facts


Invertebrate Facts


Invertebrates represent the largest number of animals in the ocean. There are 17 main groups of invertebrate identified by scientists which live in the sea.

More Facts about Ocean Animals

Facts about Whales

- Mammal Facts -

Facts about Whales

Facts about Whales: Learn all about whales including the blue whale, orca whale, humpback whale and more.

Manatee & Dugong Facts

- Mammal Facts -

Facts about Dolphins

- Mammal Facts -

Coral Reef Facts

- Invertebrate Facts -

Facts about Sharks

- Fish Facts -

Facts about Sea Turtles

- Reptile Facts -

Seahorse Facts

- Fish Facts -

Facts about Rays

- Fish Facts -

Facts about Jellyfish

- Invertebrate Facts -

Facts about Starfish

- Invertebrate Facts -
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