A Ticken is an enemy in the Subspace Emissary. Its name refers to the ticking of a bomb, since it acts a lot like one. It looks like a giant, metallic chicken, though upon defeat, its "body" falls apart and reveals that a yellow bird was piloting the Ticken. The bird chirps, then flies away. The Ticken attacks by flying into the air, and then attacks with an attack similar to the Bowser or Yoshi Bomb.
An enemy that looks like a chicken--quite a hefty chicken. But despite its weight, it can indeed fly. After taking a certain amount of damage, a Ticken will open up to reveal a little chick enemy. Notice the two bolts on its belly? And what's the deal with the four missing bolts? It probably hasn't even noticed they're missing.