The emu: It's the second-largest bird in the world. How big is it? Let's just say that its eggs can be almost 9 inches long!

These are the largest tortoises in the world, yet they are only two inches long when they hatch! That's one of the facts you can learn from this worksheet.

Do you measure distance in inches or seconds? When do you use miles? Answer these and more with this third-grade worksheet about the customary system of measurement!