The Case of the Disappearing Picnic Baskets / The Case of the Lost Critter Mac and Billy try to break the world record for the biggest pile of nuts and berries and pick them up from all around the park--but the animals that fed on those fruits and are very hungry now! // With help from Rosybarb, Happy Plumb, and the twins, the Secret Environmental Agency starts an investigation into a lost critter and learns how different animals take care of their offspring.