Sloths are known for how slowly they move, but their slow speed isn't just a funny quality they have— it's part of why their species has survived for 64 million years. Following is the text of ...

Sid, the central sloth in the “Ice Age” franchise, is slow of wit but swift in body, while “Zootopia” installed its sloth, Flash, as an unhurried employee of the Department of Mammal Vehicles.