The penguin known as “Happy Feet” has vanished in the ocean on his way home from New Zealand, eluding his trackers just days after his release and leaving behind a mystery that may never be solved.

An Emperor Penguin dubbed "Happy Feet" stands on a beach on Kapiti coast June 20, 2011. The bird's arrival, the second ever recorded according to New Zealand's Department of Conservation, has caught ...

WELLINGTON, New Zealand — He needed a little push before speeding backward down a makeshift slide. Once in the water, he popped his head up for one last look. And then he was gone. The wayward emperor ...