They named the kiwi Piwi because he was so small. Videos posted of kiwi treadmill training—part of Piwi's rehabilitation—soon had more than 700,000 views. And now people are rooting for Piwi ...

And newly released video shows some of the king penguins in a colony there running on treadmills ... the researchers were curious about how the bird, which swims as its primary form of locomotion ...