Rabbits - BJ is pretending to be a great detective. But all great detectives need a mystery to solve! One quickly comes his way when an animal nibbles on one of Baby Bop's healthy snacks. BJ, Barney, and Baby Bop uncover several clues along the way and soon realize the animal is someone's pet rabbit. Listen - When Riff hears a mysterious sound in the park, he plays detective, trying to solve the mystery. Barney and the children join in the fun. Along the way, they explore the sense of sound while identifying sounds of nature and the neighborhood.