Science is all about classification, and the animal kingdom has two basic groups: those without backbones, invertebrates, and those with backbones, vertebrates.
Some animals, like humans, have backbones, but many others do not. In fact, invertebrates make up 97% of all living things!
Just like plants, animals have to adapt to survive in their environments. And some of those adaptations, like zebra and tiger stripes, are pretty cool, too.
What kind of animal has a shell? Arthropods. They are a special kind of invertebrate with a lot of unique characteristics.
Just like plant cells, animal cells are workaholics. They do all kinds of jobs in the body to keep things running smoothly.
Where does an animal's life begin? And where does it end? Find out right here.
Kingdoms are one of the ways scientists keep all the billions of living things in the world straight. Do you know all the kingdoms?