What are all of the animals world?

It's impossible to list *all* the animals in the world! There are estimated to be millions of species, many of which are still undiscovered. However, we can broadly categorize them based on their shared characteristics:

Kingdom Animalia:

* Invertebrates: Animals without a backbone. This is the largest group, containing over 95% of all animal species. Examples include:

* Arthropods: Insects, crustaceans, spiders, scorpions, etc.

* Mollusks: Snails, clams, octopus, squid, etc.

* Annelids: Earthworms, leeches

* Echinoderms: Starfish, sea urchins, sea cucumbers

* Cnidarians: Jellyfish, corals, sea anemones

* Porifera: Sponges

* Platyhelminthes: Flatworms

* Nematodes: Roundworms

* Vertebrates: Animals with a backbone.

* Fish: Sharks, rays, bony fish

* Amphibians: Frogs, toads, salamanders

* Reptiles: Lizards, snakes, turtles, crocodiles

* Birds: All bird species

* Mammals: Humans, primates, cats, dogs, whales, dolphins, etc.

Beyond these categories:

* Microorganisms: Many tiny animals, like protozoans, are too small to be seen with the naked eye.

* Extinct animals: Many species have gone extinct throughout history.

* Undiscovered animals: Scientists are constantly finding new species, especially in remote areas.

To get a better idea of the diversity of animals, you can explore:

* Online databases: Websites like the Encyclopedia of Life (EOL) and the IUCN Red List provide information on animal species.

* Museums: Natural history museums showcase diverse animal collections.

* Field guides: These books help you identify animals in your local area.

Remember, the animal kingdom is vast and fascinating! Exploring its diversity will reveal the incredible beauty and complexity of life on Earth.