Discover, Appreciate, & Understand the Animal World!

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See All Animals A-Z!

We believe that if people know more about the world’s creatures they will better care for them. That’s why we add new animals for you to discover – each and every day! Learn about any animal using the search box below or subscribe to our YouTube Channel. Also, be sure to check out our growing list of Animal Quizzes.

Discover Your Favorite Animal Today!

Latest from A-Z Animals

Discover Every Type of Rattlesnake: The 40+ Types of Rattlesnakes

Rattlesnakes are venomous reptiles that you should avoid as much as possible. While some species deliver less harmful bites, any rattlesnake bite can turn fatal quickly. Most rattlesnake species have… Read More

By Dayva Segal 3 mins ago

10 Chicken Breeds That Lay Speckled Eggs

Chickens lay eggs in so many colors, from chalky white to dark chocolate brown. They lay blue, green, pink, and even purplish eggs. And several chicken breeds lay speckled eggs,… Read More

By Tavia Fuller Armstrong 8 hours ago

Chihuahua vs Min Pin: What Are 8 Key Differences?

Miniature Pinschers and Chihuahuas are both very small dogs that share many traits. It’s no wonder most people mix up these two dog breeds. But don't be fooled, these two… Read More

By Jennifer Gaeng 9 hours ago

Haddock vs Cod – 5 Main Differences Explained

Haddock and cod are both very popular white fish. Similar in body and nutrition, and about equally affordable, there are nonetheless some differences in appearance, flavor, and nutrients. The main… Read More

By Rebecca Bales 10 hours ago

Burro vs Donkey – Is There a Difference?

Donkey, burro, ass, jack, jenny, jennet - there are so many different terminologies associated with this sturdy pack animal. You may be wondering, "Was that donkey I saw or rode… Read More

By Abby Parks 11 hours ago

11 Ancient Mammals that Lived Alongside Dinosaurs

Mammals have existed for 170-225 million years and some ancient mammals that lived alongside dinosaurs were called mammaliaforms. The defining differences between the terms are fuzzy so we’re including examples… Read More

By Kristen Holder 12 hours ago

Discover The 10 Types Of Rattlesnakes In Texas

Rattlesnakes in Texas are practically part of the landscape, living anywhere from rocky desert canyons to your own backyard. Starting in late February and early March, the weather in Texas… Read More

By Kellianne Matthews 13 hours ago

The 11 Most Expensive Chicken Breeds in the World in 2024

Chickens are a huge part of our diet. We not only eat their meat but also eat and enjoy the eggs they lay. Although there are a great many chickens… Read More

By Lev Baker 14 hours ago

Lambs vs Sheep — 5 Major Differences Explained

Do you sometimes look at lambs and sheep and wonder 'Are lamb and sheep the same'? There’s a good reason lambs and sheep look similar. A lamb is a baby… Read More

By Heather Ross 15 hours ago

The 7 Main Types of Animals And Their Characteristics

There are many different types of animals in the world, but some of the largest categories include:

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.

Explore Types of Wild Animals from Around the World

We track thousands of animals from every continent and corner on earth, and are adding more every day!

  • African Animals – Africa is home to some of the most incredible and dangerous animals in the world.
  • Asian Animals – Asia has the world’s longest coastline, and an amazing diversity of exotic animals, birds, and more.
  • Central American Animals – Discover the the nearly 400 different animals we track in Central America today.
  • Eurasian Animals – Eurasia has some of the rarest animals in the world, like Siberian Tigers and Snow Leopards.
  • European Animals – We track over 500 different animals in Europe, including wolves and bears.
  • North American Animals – North America has many beautiful national parks that house some of the rarest animals on earth.
  • Marine (Ocean) Animals – The ocean is teaming with life, from the smallest shrimp to the largest animal ever – the Blue Whale!
  • Oceanian Animals – Oceania has many islands, and the world’s highest concentration of marsupials.
  • South American Animals – Home to the stealthy Jaguar, the friendly Capybara, and many more!

See Endangered and Extinct Animals Lists

A-Z Animals follow’s the IUCN Red List of Threatened Species definitions of threatened and endangered animals. Please consult the lists below to learn more about which animals need our help the most

  • Extinct – Species that no longer exist on earth
  • Extinct in the Wild – Species that are only known to survive in captive or cultivated environments
  • Critically Endangered – Animals that face an extremely high risk of extinction in the wild
  • Endangered – Animal species that face a high risk of extinction in the wild
  • Vulnerable – Animal species that face a risk of extinction in the wild
  • Near Threatened – Species that are facing population challenges and likely to become vulnerable to extinction soon
  • Least Concern – Animals with strong populations that are not expected to face extinction risk in the near future
  • Data Deficient – Species where we lack adequate information to assess the risk
  • Not Evaluated – Animal species that have not been evaluated yet

Types of Animals By Letter: Explore A to Z Animal Lists

See lists of animals that start with every letter of the alphabet, from A to Z. We track all types of animals like lions and tigers, dogs and cats, even dinosaurs and spiders. Choose your favorite letter below to see all animals that start with it today.

A Amberjack
Animals that Start with A

Example: The Amberjack

A Berger Blanc Suisse
Animals that Start with B

Example: The Berger Blanc Suisse

A Common Buzzard
Animals that Start with C

Example: The Common Buzzard

A Discover 13 Blue Snakes Found Around the World
Animals that Start with D

Example: The Discover 13 Blue Snakes Found Around the World

A English Cocker Spaniel
Animals that Start with E

Example: The English Cocker Spaniel

A Feist
Animals that Start with F

Example: The Feist

A Giant Salamander
Animals that Start with G

Example: The Giant Salamander

A House Finch
Animals that Start with H

Example: The House Finch

A Irish Terrier
Animals that Start with I

Example: The Irish Terrier

A Jumping Spider
Animals that Start with J

Example: The Jumping Spider

A King Rat Snake
Animals that Start with K

Example: The King Rat Snake

A Long-Haired Rottweiler
Animals that Start with L

Example: The Long-Haired Rottweiler

A Milkfish
Animals that Start with M

Example: The Milkfish

A Numbat
Animals that Start with N

Example: The Numbat

A Ostracod
Animals that Start with O

Example: The Ostracod

A Potoroo
Animals that Start with P

Example: The Potoroo

A Quoll
Animals that Start with Q

Example: The Quoll

A Red Ackie Monitor
Animals that Start with R

Example: The Red Ackie Monitor

A Samoyed
Animals that Start with S

Example: The Samoyed

A Tortoise
Animals that Start with T

Example: The Tortoise

A Urechis unicinctus (Penis Fish)
Animals that Start with U

Example: The Urechis unicinctus (Penis Fish)

A Velociraptor
Animals that Start with V

Example: The Velociraptor

A Which State Has the Most Fatal Bear Attacks?
Animals that Start with W

Example: The Which State Has the Most Fatal Bear Attacks?

A Xenacanthus
Animals that Start with X

Example: The Xenacanthus

A Yellowtail Snapper
Animals that Start with Y

Example: The Yellowtail Snapper

A Zuchon
Animals that Start with Z

Example: The Zuchon

Everything To Know About Pet Dogs, Cats Birds, and More

Some of the most popular types of animals on earth are pets. A pet is a domesticated animal that lives with a person or family, usually in a house. The most common pets include dogs, cats, fish, and birds, but there are also many amazing exotic pets like reptiles, lizards, and more! Horses, goats, and pigs can also be pets too.

Pet Dogs

Dogs are the most popular type of pet on earth with nearly 500 million worldwide. Thats almost one dog for every 15 people on earth! There are hundreds of different dog breeds. The Irish Wolfhound is the largest dog breed, and was bred to hunt wolves. Chihuahuas are the smallest, and were likely bred for companionship or to hunt small rodents. The most popular dog breeds are below.

A Boston Terrier
Boston Terrier

Friendly, lovable and very strong!

A Irish Setter
Irish Setter

Has a beautiful coat that's flowing and feathered!

A Golden Retriever
Golden Retriever

Trusting, kind and gentle!

Pet Cats

Cats are the second most popular pet on earth with nearly 400 million worldwide. Thats almost one pet cat for every 20 people on earth! You can read about the hundreds of different cat breeds, from the large to the small. The most popular cat breeds are below

A Abyssinian

One of the oldest cat breeds in the world!

A Australian Mist
Australian Mist

The only cat breed to originate in Australia.

A Ragdoll

One of the larger breeds of domestic cat!

Pet Product Reviews

Pets are important members of our families and should be cared for. The AZ Animals team reviews the latest research on pet health, consults veterinarian best practices, and works directly with vet health specialists to review the best products for your dog, cat, and other pets. We’re excited to share our expert pet product recommendations with you, including the best dog food, best cat food, and best tanks for your pet fish

More Animal News, Facts, Rankings, and More!

Discover 9 Black and White Snakes: Types and Where They Live

The world is home to thousands of snake species, each with a different color, shape, and size. This includes many different species of black and white snakes. Sometimes, snakes are… Read More

By Megan Martin 16 hours ago

Beware of These 9 Foods That Contain the Most Mercury

As time progresses, many people are becoming more health conscious and worried about what they eat. While a huge part of maintaining a healthy diet is finding a balance between… Read More

By Alanna Davis 17 hours ago

The 10 Most Common Animals That Live in the Amazon Rainforest

Spanning eight countries and 2.1 million square miles, the Amazon rainforest is one of the world's most vast and diverse ecosystems. As well as having around 40,000 species of plants… Read More

By Hannah Ward 17 hours ago

Polar Bear vs. Tiger: Which Would Win in a Fight?

Polar bears and tigers both reach a near-mythological status in the minds of humans. They’re two apex predators from distinct genealogical lines, but they share the ability to inspire amazement… Read More

By Maxwell Martinson 18 hours ago

Understanding Your Cat: 5 Types of Cats Personalities

While different stereotypes go along with “cat people” vs. “dog people” (I’m sure a few just popped into your head), there are also stereotypes about cat personalities and dog personalities.… Read More

By Cindy Rasmussen 19 hours ago

How Are Chicken Eggs Fertilized?

Did you that hens can lay eggs without a rooster? Fertilization of the egg is necessary for the hatching of a chicken. The vast majority of store-bought eggs come from… Read More

By Jennifer Gaeng 20 hours ago

Discover The Snake-Infested Volcanic Island Known As “The Biggest Rattlesnake Nest In The World”

Imagine being abandoned on a volcanic rattlesnake-infested island. This nightmarish scenario is exactly what happened to a few scientists recently. Not all rattlesnakes are dangerous, but still, no one wants… Read More

By Nixza Gonzalez 21 hours ago

Porcupine vs Hedgehog: 8 Main Differences Explored

With one look at the collection of quills on their backs, you’d think the porcupine and the hedgehog are related. However, while they're both mammals, they have a lot of… Read More

By Lex Basu 22 hours ago

Top 10 World’s Largest Dinosaurs Ever

Dinosaurs were massive, incredible reptiles that roamed the planet for millions of years. Although some of them were the size of chickens, like Velociraptors, others stood taller than giraffes, like… Read More

By Rebecca Bales 23 hours ago

Discover 12 Amazing Blue Chicken Breeds

If you're eager to learn about chickens but want to explore something a little out of the ordinary, we have just the thing for you. In the poultry world, the… Read More

By Lev Baker 1 day ago

These 7 Crime-Solving Animals Are Like Nature’s Sherlock Holmes

We all know the police use dogs to sniff out drugs and cadavers and track criminals on the run. And forensic scientists are able to use insects to determine things… Read More

By Drew Wood 1 day ago

Rattlesnake Population By State

Rattlesnakes are native to the United States, but how many species does each state boast? If you have ever wondered what the rattlesnake population is by the state, here is… Read More

By Heather Hall 1 day ago

Ear Mites vs. Ear Wax in Dogs: Identification and Treatment Options

Dog ears are truly remarkable as they hold an extraordinary trait when it comes to detecting sounds. Thanks to the ear structure's sensory organ, your dog can navigate their surroundings… Read More

By Kayeleen Parsons 1 day ago

Discover the Top 8 Fastest Dinosaurs Ever to Walk the Earth

Dinosaurs roamed the earth during the Mesozoic Era, which included the Triassic, Jurassic, and Cretaceous Periods. The term dinosaur is used to define any group of extinct carnivorous or herbivorous… Read More

By Lev Baker 1 day ago

Dreaming of Chickens: Discover the Spiritual Meaning and Interpretation

Humble chickens are often seen pecking around in farmyards or featured on the dinner table. Yet, this bird holds quite a deeper significance than one might initially think. In various… Read More

By Zeek Lepakko 2 days ago

Would You Hug A Snake? Meet The 10 Friendliest Snakes In The World

I love hugging my friend’s big fluffy Bernese mountain dog, but a snake? I’m not so sure. I know there are a few snakes that I would not want to… Read More

By Cindy Rasmussen 2 days ago

5 Shark-Infested Texas Beaches With the Most Attacks

According to the Florida Museum’s International Shark Attack File, 44 recorded shark attacks have occurred in Texas waters since 1911. But a few shark-infested Texas beaches have more attacks than… Read More

By Brandi Allred 2 days ago

See 6 Spiders That Look Like Daddy Long Legs

Spiders are one of the few animals that are sometimes called “daddy long legs”, but not every spider holds this title. Daddy's long legs typically refer to invertebrates with long… Read More

By Emilio Brown 2 days ago

Types of Black Snakes

For most of us, the term “black snake” can refer to just about any snake that is mostly black. From this perspective, potentially hundreds of snakes could be black snakes,… Read More

By Hailey Pruett 2 days ago

Discover 5 Extinct Dog Breeds!

If you go to the dog park you will likely see dog breeds of all shapes and sizes. A 130-pound St. Bernard could be playing with a 13-pound mini schnauzer!… Read More

By Jesse Elop 2 days ago

See all of A-Z Animals News and Information.

Animal Reference Guides And Educational Resources

We believe if people are more educated about the world’s animals, they will better car for them. That’s why we are building the world’s greatest animal encyclopedia, completely free to you. Please take a moment to learn more about animals today using these helpful guides and resources:

  • Reference Library – See helpful information on conservation, classification, animal evolution, and more
  • Glossary – A list of scientific and technical animal terms, with definitions
  • Animal Habitats – Learn all about different animal habitats
  • Diet – The different animal diets like omnivores, herbivores, and carnivores defined with examples
  • Behavior – Learn all about animal intelligence, communication, community, language, migration, and more.

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.