rats

(Runtime 1:03)If you’ve ever tried to lose any body fat, you may have spent some time on the dreaded treadmill. Now, imagine tiny treadmills that are…

Giant rats sound like something to be scared of, perhaps. But the Point Defiance Zoo & Aquarium in Tacoma, Washington, thinks quite the opposite about the African giant pouched rats it just put on display. The rodents are billed as "hero rats."