What makes a reptile different from an amphibian?  Learn all about animal classifications in this worksheet for second and third graders!

In this North American animal tracks worksheet, students hone their observation skills by matching tracks to animals.

Learn the ins and outs of one of the body's most important organs: the heart!

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

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

Dig into the past with this third-grade worksheet all about fossils!

The narwhal is one unusual animal! Your child will learn about this horned sea creature through text and pictures.

Whoa, this spider is quite the spinster! He is actually one of many brand new species discovered between 2009 and 2011.

Give your child a great coloring page full of fun flower facts! This one is about the iris flower and the butterfly.

Introduce your child to a fascinating new animal, the Baird's tapir. This is just one of many endangered species around the world.

Learn more about the bones in your body and just how important they are with this reading sheet and diagram, all in one.

Walter's Duiker is a new species of duiker, a kind of antelope, and one of many new species discovered between 2009 and 2011.

Did you know people can live with just one kidney? Get a head start on human anatomy with this info sheet on kidneys.

Get to know some of the friendly, furry, feathery river wildlife that live near American rivers, then match each one to its home.

Ever wonder how the human body functions? Enjoy this great info sheet all about the human heart, one of our most important organs.

All living things go through many changes as they grow to be adults! Help your little one understand how he will grow and change.

Color the T Rex Leech! Named for its sharp teeth, he is one of many brand new species discovered in the past two years.

Coyotes' famous howl gave them the nickname "song dogs." This is just one of several coyote facts your child can learn from this worksheet.

Our silkworm facts help your little one understand more about these special invertebrates. He'll read about their life stages and answer some questions.

Get outside and take a stroll! This leaf guide will give your little one a great learning experience the next time you're out at the park.

Learn all about the liver with this anatomy sheet. Our liver is one of many organs in the digestive system expelling waste from the body.

So what on earth is this funky creature? He is a Louisiana Pancake Batfish, one of several brand new species discovered within the past two years.

All the animals in this word search share one characteristic: none of them have bones! Can your child find the boneless critters hidden in the puzzle?

Did you know new species of animals are discovered every year? Color in this little cricket, the only one of his kind who can pollinate plants!

Get to know one of the most unique and colorful monkeys, the red-shanked douc langur. Read about why they are an endangered species with this info-sheet.

Did you know that your tongue is one of the strongest muscles in your body? Tickle your learning taste buds with this worksheet all about your tongue.

This lizard can grow to over six feet long! Color the Golden Spotted Monitor Lizard, one of several brand new species discovered between 2009 and 2011.