Rocky Mallard is a singing, animatronic duck on a plaque, from Lhi Chinn Industrial. It requires four C batteries.
Two versions exist, including a Mallard version and a recolor that's mostly yellow but with white wings and a tail that's partly brown.
It sings "500 Miles", shakes its tail, turns its head, and moves its beak. It can be activated by pressing a button on its plaque, or in motion sensor mode, it should start singing and dancing if you walk past it. The switch for motion sensor mode should be located near the battery compartment.
He can also quack and say some phrases in a voice that sounds like Donald Duck speaking. I can't make out the other lines, but two of them sound like, "I want to go home," and "Oh, that's too bad."
Most images on this page came from listings that are no longer up. One photo came from howshan.com, and images of the yellow one without its box came from this sold listing.