Deinonychus (dye-NAH-nih-kuhss) and other slashers had big, curved, razor-sharp claws. What was special about one of these claws? Answer: The claw on the second toe of a slasher’s foot was shaped...

Quetzalcoatlus (kwet-zal-koh-AHT-lus) was a giant reptile that flew in the sky. Yet this prehistoric creature was very different from today’s birds. How? Answer: It had no feathers on its wings. It...