Polar bears and the Arctic：a nonfiction companion to Magic Tree House #12: polar bears past bedtime Dolphins and sharks：a nonfiction companion to Magic Tree House #9: Dolphins at daybreak Llamas and the Andes：a nonfiction companion to Magic Tree House #34: late lunch with llamas." Mummies and pyramids：a nonfiction companion to Magic tree house #3: Mummies in the morning Ninjas and samurai：a nonfiction companion to Magic tree house #5 : Night of the ninjas American Revolution：a nonfiction companion to Magic tree house #22 : Revolutionary War on Wednesday Mummies and pyramids：a nonfiction companion to Magic tree house # 3, Mummies in the morning Warriors：a nonfiction companion to Magic tree house #31: Warriors in Winter Snow leopards and other wild cats：a nonfiction companion to Magic Tree House #36: Sunlight on the snow leopard Ninjas and samurai :：a nonfiction companion to Magic tree house #5 : Night of the ninjas /