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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
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.
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.
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.
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.
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.
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.
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: Everything To Know About Cat and Dog Breeds
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!
Most Popular Pet Dog Breeds
Friendly, lovable and very strong!
Trusting, kind and gentle!
See a complete list of dog breeds.
Most Popular Pet Cat Breeds
The oldest breed of cat in the world!
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
Example: The Colossal Squid
Example: The English Pointer
Example: The Fluke Fish (summer flounder)
Example: The Great White Shark
Example: The Italian Greyhound
Example: The Komodo Dragon
Example: The Scorpion Fish
Example: The Welsh Terrier
Example: The Xoloitzcuintli
Example: The Yellowfin Tuna
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 Habitats, Diet, Behavior and much more…
In a new study out of China, researchers have made some significant discoveries linking habitat fragmentation and giant panda reproduction and ultimately conservation. Giant pandas are one of the world’s most beloved species. Native to China’s temperate forests, this black and white mammal is part of the bear family. They primarily eat bamboo and take […] Read More
In recent years, the worsening California wildfires raging across the Golden State have eaten up millions of acres of forestland. The resulting loss erases the habitat of forest dwelling wildlife, forcing them to vacate if they don’t succumb to the flames and heat. Already in 2021, more than 10 fires have scorched nearly 2 million […] Read More
Mosasaurus vs Megalodon; in a fight between these giant aquatic predators, who would emerge victoriously? Hypothetical scenarios like these always require us to bend our imagination to allow such a fight to happen in the first place. Mosasaurus, or “lizard of the Meuse River,” is an extinct species of squamate reptile. It lived 82 to […] Read More
Chickens are not mammals. They are birds. They have feathers as opposed to hair or fur, and they have wings, even though they don’t fly very well. They lack the teeth that most mammals have, they exclusively lay eggs, and they don’t nurse their chicks with milk. It is true that a few birds do […] Read More
Nature makes many odd creatures, but one of the strangest on earth must be the armadillo. This animal looks like it’s wearing a suit of armor, and its name means “little armored one.” Some people think armadillos are amphibians or reptiles, but they’re not. They’re mammals. 5 Amazing Facts About Armadillos Armadillos eat many insects, […] Read More
Have you ever watched a video of a group of dolphins swimming next to a boat? If so, you probably saw them leaping, diving, splashing and having a ball. As you watched this display you may have wondered: Why do dolphins follow boats? Do they do it just for fun or is there another reason? […] Read More
In North America, bigger is usually better. Both Canada and the United States are amongst the 10 largest countries in the world by area! In these big countries, there are many very big animals. From bison grazing in golden plains to polar bears traversing barren ice fields, incredibly large animals are found throughout North America. […] Read More
If you’re looking for a delicious, healthy meal for dinner, two fish that might come to mind are trout and salmon. Trouts and salmon are closely related, but have key differences. Below we’ll dig into the differences between trout and salmon. How are they different as animals, what are the taste differences, and how is […] Read More
Human progress has led to the development of new ecosystems — and as our population has sprawled into the territories of other creatures, they’ve come to adapt to survive in our urban environments. Out of all the animals that are seen in the suburbs and cities, raccoons are often one of the most ubiquitous. With […] Read More
Almost all wild dogs, wolves, and even domestic dogs howl in one way or another, and it’s common knowledge that wolves howl at the moon. Right? It’s lived in folklore and entertainment for as long as it’s been written down and recorded, but do wolves actually howl at the moon? In short, no. It’s nothing […] Read More
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