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

Search this puzzle for onomatopoeias of animal sounds in other languages! How do they compare to the onomatopoeias you know?

Test your knowledge of prehistoric animals with this life sciences 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.