<p>Why do lizards have scales? Why are reptiles cold-blooded? Why do lizards have long tongues? How do lizards grow their tails back? Are crocodiles dinosaurs? What’s the difference between an alligator and a crocodile? Why do crocodile eyes look like they have mirrors in the back? How do crocodiles chomp? Why do crocodile teeth stay sharp? Why are crocodiles green? Why do crocodiles swim? Answers to all of your crocodile and alligator questions with Venetia Briggs-Gonzalez, one of the researchers known as the Croc Docs at the University of Florida.</p>

<p>Download our learning guides: <a href="https://npr.brightspotcdn.com/0f/b3/86c824af4bca8be75dd2cc092c42/how-do-crocodiles-chomp.pdf" rel="nofollow" target="_blank">PDF</a> | <a href="https://docs.google.com/presentation/d/1cmGungS5SXWErb2nAek5ZKjn3zmshb5nIDHs7jUf6T4/copy" rel="nofollow" target="_blank">Google Slide</a> | <a href="https://npr.brightspotcdn.com/59/c6/ea8c167041ffa746616c31cabd48/butwhy-crocodilians-231-transcript.pdf" rel="nofollow" target="_blank">Transcript</a></p>

Why are cockroaches so yucky?

But Why is a show led by kids. They ask the questions and we find the answers. It’s a big interesting world out there. On But Why, we tackle topics large and small, about nature, words, even the end of the world. Know a kid with a question? Record it with a smartphone. Be sure to include your kid's first name, age, and town and send the recording to questions@butwhykids.org!