The silverback gorilla is a special animal. This magnificent male is part of an endangered species. Complete this sheet to learn all about this gentle giant.

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

Learn more about what lives--and what thrives--in marshes with this fill-in-the-blank worksheet on marsh ecosystems.

Alfred Nobel, though he held over 300 patents in his lifetime, is most famous for inventing dynamite.

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!