1. Vertebrates and Invertebrates
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2. Choose a category to explore
Vertebrates
Invertebrates
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3. Vertebrates Four vertebrate classes Aves-Birds Reptelia-Reptiles
Amphibia-Amphibians
Mammalia-Mammals
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4. Invertebrates Annelids Arachnids Insects Mollusks
Four Invertebrate classes
Arachnids
Annelids
Insects
Mollusks
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5. Aves-Birds
There are over 8,000 species of birds.

6. Reptelia-Reptiles
The most common reptiles include alligators, crocodiles, lizards, snakes, tortoises and turtles.

7. Amphibia-Amphibians
Most amphibians can both walk and swim in water.

8. Mammalia-Mammals Most mammals have hair, or fur, covering their body.
Most mammals walk on 4 legs, with only the humans walking upright on 2 legs.

9. Annelids
There are about 9,000 species of Annelids known today, including worms and leeches.
There are many types of worms.

10. Mollusks
Mollusks were among the first inhabitants of the Earth.

11. Arachnids Common arachnids are spiders and scorpions.
There are also mites and ticks which are small arachnids that are parasites.

12. Insects
There are over 800,000 different types of insects.