What's the animal that swims upstream? Help your child figure this out with this cold-blooded animal crossword puzzle worksheet.

Kids learn important plant and animal cell vocabulary as they plug the words into their correct spots and complete the puzzle.

Test your knowledge of prehistoric animals with this life sciences crossword puzzle!

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

Did you know that invertebrates don't have backbones? Find out some different types of invertebrates with the clues in this crossword puzzle.