While visiting the zoo, Matt and Billy get to see a lot of different animals, including giraffes and sea lions, and learn many interesting things about them from watching them go about their daily tasks. Simultaneous.

Karen Wallace is the author of numerous children's books, one of which, Think of an Eel, won the Kurt Maschler Award. She also writes children's television scripts, as well as natural history programs and documentaries. She lives in England with her husband, novelist Sam Llewellyn.