Want to Make an Alligator Angrier Than Normal? Make It Use a Treadmill

Want to Make an Alligator Angrier Than Normal? Make It Use a Treadmill: Alligators, crocodiles and gharials aren't known for their easygoing nature -- and they get even less friendly when you force them to run on a treadmill. But it's worth it, because watching crocodilians exercise might teach us how dinosaurs breathed.