01 The King Penguin 02 Looking Closely at the World 03 On the Rise 04 A Sticky Lesson 05 Review(Lessons 1-4) 06 Pangaea 07 Jackson’s Chameleon 08 Moving Energy 09 The Arboreal Tarantula 10 Review(Lessons 6-9) 11 The Keel-billed Toucan 12 Clean Energy 13 The Firefly 14 The Mosquito 15 Review(Lessons 11-14) 16 The Praying Mantis 17 The House Cricket 18 The Brood X Cicada 19 The Boa Constrictor 20 Review(Lessons 16-19) 21 The Great Egret 22 Mold Following a Trail 24 Living in Groups 25 Review(Lessons 21-24) 26 Human Civilization 27 The Black Vulture 28 Common Snapping Turtle 29 Vitamins 30 Review(Lessons 26-29) 31 The Bottom of the Ocean 32 Earthquakes 33 The Andean Condor 34 The Mockingbird 35 Review(Lessons 31-34) 36 The Great Blue Heron 37 Tiny Pluto 38 Computer Habits 39 Ruby-throated Hummingbird 40 Review(Lessons 36-39) 41 The Peregrine Falcon 42 The Atlantic Puffin 43 The Amazon River Dolphin 44 The Names of Stars 45 Review(Lessons 41-44) 46 Anyone Out There7 47 Fascinating Chimps 48 The Common Loon 49 The Brown Pelican 50 Review(Lessons 46-49)