Animal Worksheets

How do scientists classify animals? One of the biggest distinctions is the backbone. Did you know that about 95 percent of the animal world doesn't have a backbone? That's right- about 95 percent of all animals are invertebrates. They include flies, mosquitoes, spiders, worms, corals, sponges, and so many more. Explore our invertebrate unit to learn more about the majority of the animals of the world. You can also learn about the five main groups of vertebrate animals -fish, amphibians, reptiles, birds, and mammals-that are a little more familiar to most of us. Help kids develop important vocabulary and spelling skills with our puzzles and games.