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A-Z Animals is the world’s most trusted online animal encyclopedia. If you want cute animals, wild animals, weird animals or are looking for comprehensive pet guides for dogs and cats, we’ve got you covered!

We believe that if people know more about the world’s creatures they will better care for them. Thats why we add new animals for you to discover – each and every day! Learn about any animal using the search box below:

The 7 Major Types Of Animals

Mammals around the world!


The official mammal class is Mammalia. Animals that are considered mammals include warm-blooded vertebrates that have hair or fur and whose babies drink milk. Unlike other animal types like birds and insects, all mammal babies drink milk that comes from their mother’s bodies. This is one of the key ways to know if an animal is a mammal.

See the complete list of mammals.

Close up of a colorful lizard


Lizards, dinosaurs, crocodiles, turtles, and snakes – all belong to that ancient and stout class of animals known as the reptiles. This is a diverse group with more than 10,000 different species and a huge representation in the fossil record. Once the dominant land vertebrates on the planet, reptiles still occupy just about every single ecosystem outside of the extreme north and south.

See the complete list of reptiles.

Beta fighting fish


Fish are aquatic vertebrates. They usually have gills, paired fins, a long body covered with scales, and tend to be cold-blooded. "Fish" is a term used to refer to lampreys, sharks, coelacanths and ray-finned fishes, but is not a taxonomic group, which is a clade or group containing a common ancestor and all its descendants.

See the complete list of fish.

Colorful birds


Birds, members of the class Aves, include more than 10,400 living species. Their feathers distinguish them from all other classes of animal; no other animals on earth have them. If you see an animal with feathers, it’s undoubtedly a bird. Like mammals, birds are warm-blooded vertebrates with four-chambered hearts. However, they are more closely related to reptiles and are believed to have evolved from dinosaurs.

See the complete list of birds.

Golden eyed leaf frog


The official class of amphibians is Amphibia. To have the classification of an amphibian, an animal must be a vertebrate, require water to survive, be cold-blooded, and spend time both on land and in water. Though other animals only live on land or in the water, amphibians have the unique ability to thrive equally in both. Amphibians cover over 6,000 different species across the globe, but about 90% are frogs.

See the complete list of amphibians.

Queen butterfly danaus gilippus on blue hydrangea flowers.


The definition of an invertebrate is any animal that does not have a backbone or vertebral column. The most prolific and easily recognizable members of the invertebrate family are insects. It’s estimated that upwards of 30 million individual species of invertebrates may exist accounting for between 90-95 percent of all organisms on the planet.

See the complete list of invertebrates.

Queen butterfly danaus gilippus on blue hydrangea flowers.


All insects are part of the taxonomical phylum Arthropoda, and they are collectively referred to as arthropods. It is common to see this name misspelled as “anthropod,” but this is not the correct term. They can be found in nearly every environment on the planet, and they currently account for over half of all known living organisms in the world. They have undergone many cycles of evolution depending on the resources available to them.

See the complete list of insects.

Pet Guides:幸运飞行艇官网开奖|飞行艇官网视频|幸运飞开艇开奖直播

Want to know how to raise a puppy or kitten? Curious to learn more about big and small dog breeds or cat breeds? Check out our comprehensive pets guides below!

A Irish Setter
Irish Setter

Can live for up to 16 years!

A Boston Terrier
Boston Terrier

Friendly, lovable and very strong!

A Golden Retriever
Golden Retriever

Trusting, kind and gentle!

See a complete list of dog breeds.

A Abyssinian

The oldest breed of cat in the world!

A Australian Mist
Australian Mist

First bred in the 1700s!

A Ragdoll

One of the larger breeds of domestic cat!

See a complete list of cat breeds.

Expert Pet Product Reviews

The AZ Animals team has spent years working with and studying the latest research on what products are best for our pets and yours, and we’re excited to share our expert pet product recommendations with you.

See all of our Expert Pet Product Reviews.

Explore Animals from Around the World

Animals By Letter: Explore A to Z Animal Lists

A Aardvark
Animals that Start with A

Example: The Aardvark

A Basset Fauve de Bretagne
Animals that Start with B

Example: The Basset Fauve de Bretagne

A Collared Peccary
Animals that Start with C

Example: The Collared Peccary

A Donkey
Animals that Start with D

Example: The Donkey

A English Foxhound
Animals that Start with E

Example: The English Foxhound

A Finnish Spitz
Animals that Start with F

Example: The Finnish Spitz

A Giant Schnauzer
Animals that Start with G

Example: The Giant Schnauzer

A Himalayan
Animals that Start with H

Example: The Himalayan

A Impala
Animals that Start with I

Example: The Impala

A Jellyfish
Animals that Start with J

Example: The Jellyfish

A Koolie
Animals that Start with K

Example: The Koolie

A Lemming
Animals that Start with L

Example: The Lemming

A Malteagle
Animals that Start with M

Example: The Malteagle

A Newfoundland
Animals that Start with N

Example: The Newfoundland

A Octopus
Animals that Start with O

Example: The Octopus

A Petit Basset Griffon Vendéen
Animals that Start with P

Example: The Petit Basset Griffon Vendéen

A Quetzal
Animals that Start with Q

Example: The Quetzal

A Rose-breasted Grosbeak
Animals that Start with R

Example: The Rose-breasted Grosbeak

A Springerdoodle
Animals that Start with S

Example: The Springerdoodle

A Tree Frog
Animals that Start with T

Example: The Tree Frog

A Umbrellabird
Animals that Start with U

Example: The Umbrellabird

A Vampire Bat
Animals that Start with V

Example: The Vampire Bat

A Wasp
Animals that Start with W

Example: The Wasp

A X-Ray Tetra
Animals that Start with X

Example: The X-Ray Tetra

A Yeti Crab
Animals that Start with Y

Example: The Yeti Crab

A Zebra
Animals that Start with Z

Example: The Zebra

See Endangered Animals Lists

Animal Reference Guides

We are building the world’s greatest animal encyclopedia. Be search to check out our Reference Library and Glossary to learn about Animal HabitatsDietBehavior and much more…

Animals – Facts, Pictures and Resources FAQs (Frequently Asked Questions) 

What are the 6 types of animals?

The 6 types of animals are mammals, fish, amphibians, reptiles, birds and invertebrates. Additionally, animals are classified in many different ways, which you may learn about in this complete guide to animal classification.

What are the 10 most popular animals?

The 10 most popular animals on AZ Animals are:

  1. Lion
  2. Panther
  3. Amur Leopard
  4. Polar Bear
  5. White Tiger
  6. Wolf
  7. Millipede
  8. Arctic Fox
  9. Marble Fox
  10. Rhinoceros 

How many animals are there?

There are over 1 million known animal species and more than 98% of those are insects, which are indeed animals.

Whales are huge, long-lived mammals. The blue whale is the largest animal that’s ever lived on earth – it is bigger than the dinosaurs. It can live an estimated 80 to 90 years! The bowhead whale, a somewhat smaller species, may live more than 200 years. But eventually, life comes to an end even for […] Read More

You may think butterflies look so small and delicate that they can barely eat anything. But, like all animals, butterflies need nourishment. Their favorite food is sweet nectar from plants and flowers. How and when do butterflies feed? Read on to learn all about it. Interesting Facts About How Butterflies Eat Butterflies love sugary foods.Some […] Read More

Have you ever heard of zoophobia? That is the medical term given for the general fear of animals, from the roots “zoo” meaning animal and “phobia” meaning dread or fear. Around six percent of all people suffer from some form of zoophobia during a period of their lives. For most, they fear or are disgusted […] Read More

Despite being concentrated to a small surface area of the Earth’s oceans, coral reefs are home to roughly a quarter of all marine life. The two biggest reefs — the Great Barrier Reef in Australia and the Belize Barrier Reef in the Caribbean — are popular sites for divers and snorkelers who are looking to […] Read More

All living organisms must get rid of waste in their bodies, right? Because vertebrates poop, it’s normal for humans to think other animals must poop as well. But some animals don’t do that — there are even some that don’t get rid of waste at all! These creatures have developed alternative means that are unique, […] Read More

Of all the creatures lurking within the immense depths of the ocean, the great white shark inspires more terror and awe in people than almost anything else. This fearsome animal, which makes for quite a spectacle in the water, is the largest predatory fish in the world (though not the largest predatory marine animal; the […] Read More

Animals are all around us. Because of their close proximity, many people take for granted how truly dangerous some of the animals that are right within our communities really are. In this article, we’ll discuss the 10 deadliest animals in the world ranked by the number of deaths that they are responsible for with some […] Read More

There are a lot of smart animals out there. Some are so smart, in fact, that they learn how to use things like tools or create their own devices and build things like humans do. Even animals that don’t have a history with humans know a thing or two about adapting from their environment to […] Read More

Volcanoes are dangerous and a risky place to call home. Humankind has daringly settled in the nest of many of these literally explosive environments, and so has a series of incredible animals who don’t merely survive but thrive. From birds to shrimp, these animals are among the most resilient wildlife in the world. Believe it […] Read More

The animal kingdom is full of interesting organisms that have the ability to glow. Most people know about the humble firefly, but the vast majority of glowing animals actually lurk deep within the oceans. If you’ve ever ventured beneath the surface in a submarine, you can sometimes catch glimpses of ghostly flickers looming against the […] Read More