Have you ever wondered why giraffes have long necks or why lions have sharp teeth? Find the answers in this third- and fourth-grade worksheet about adaptations!

Discover the animals and plants of the past in this fossil-focused worksheet!

Read about one of Yellowstone National Park's coolest animals, the big horn sheep.

This cute worksheet prompts your first grader to find out what characteristics are shared by amphibians, and then circle the animals that fit that category.

Does your first grader want to know more about mammals? This worksheet gives her a chance to do some research to decide which animals fit into that category.

There aren't many blue animals out there, but here's one that will be fun to color: the blue dart frog. Its bright color warns predators that it is poisonous.

Help your child learn about facts and opinions. Kids will read statements about animals before determining whether each statement is a fact or opinion.

Which of these animals are reptiles: turtle, cobra, or jellyfish? Your first grader will ponder this question and more, when it comes to this cute worksheet.

Which of these animals does not belong? Explore the plants and animals of the desert, and choose which ones are in their right habitat.

Which of these animals do not belong? Explore the plants and animals of the rainforest, and choose which ones are in their right habitat.

Expose your 1st grader to the animals of Australia in a fun way: coloring! Start with one of the cutest, most beloved animals Down Under, the koala.

Both of these animals have big ears! Your child will look at the pictures of unusual animals in this worksheet and try to learn some new things about them.

To complete this worksheet your first grader will need to match the different animals with their homes.

Learn about Red River Hogs in this series of animals facts sheets and coloring pages in one.

Read about Yellowstone's red foxes, some of the most cunning and smart animals around.

How do nonliving things help plants and animals stay alive? Find out in this first-grade worksheet!

Test your third grader's biology knowledge with this worksheet, which challenges him to separate invertebrates from animals with a backbone.

Fact: This worksheet is about unusual animals from all over the world. Opinion: This is the best fact and opinion worksheet ever!

The Australian outback is full of unusual and odd-looking animals. Check out the echidna, a spiny creature with no teeth and a long, sticky tongue.

When it comes to odd-looking animals, Australian goanna lizards probably take the cake. Kids will love coloring in this odd creature.

Track down some of the most famous animals of the Amazon -- and other places -- with this rainforest coloring page that doubles as a life-science lesson.

If your child loves animals, introduce her to a cool species of bird with this Northern Hawk Owl info sheet, complete with coloring and a crossword.

Guinea pigs are social animals that make great pets. Test your child's knowledge of these furry critters with this fun quiz.

Learn more about the animals in the swamp food chain, and find out how each living thing in a swamp ecosystem needs another to survive.

These pictures have a lot to say! The animals in this worksheet don't talkÃbut they can tell you a lot about what they're like by the way they look.