These Valentine's Day cards will be the oddest and most unique cards your sweetie ever got!

Discover the connections between the sun, plants, and animals in this fifth-grade worksheet all about photosynthesis!

What has two legs and carries its baby in a pouch? Fill in this crossword puzzle and learn some fun facts about two-legged creatures!

Help your child practice her spelling and vocabulary with this fun worksheet! Discuss with your child what it means to be cold-blooded.

Use your knowledge of sea creatures to fill out this crossword puzzle.

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.

Expand your sea creature vocabulary with this Life in the Reef worksheet!

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.

Ecosystems are an important part of fourth grade science. This fun printable will help your child with her knowledge of plants and animals.

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.

Learn about the plants and animals that make deciduous forests their home, then complete the crossword puzzle.

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.

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

Learn all about the ooey-gooey areas of land called wetlands that provide a home for certain kinds of plants and animals.

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

Encourage your child to take a nature walk, using the prompts on this worksheet to write and draw their observations of plants, animals, sounds, and more.

Constellations are not just named after animals, some of them are named after people! Learn about the constellation Sagittarius with this fun worksheet.

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.

There are many animals around the world whose lives or homes are threatened. Read about an endangered species from Africa with this info-sheet

Are you aware of how many endangered species there are in the world? Use this trivia sheet to test your knowledge of some beautiful but endangered animals.

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.

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!