42 books • 9 series
Ants (World of Insects)
Dragonflies (World of Insects)
Beetles (World of Insects)
Bees (World of Insects)
Grasshoppers (World of Insects)
Flies (World of Insects)
Cobras (World of Reptiles)
Iguanas (World of Reptiles)
Gila Monsters (World of Reptiles)
Chameleons (World of Reptiles)
Crocodiles (World of Reptiles)
Sea Turtles (World of Reptiles)
Desert Tortoises (World of Reptiles)
Rattlesnakes (World of Reptiles)
Sea Otters (World of Mammals) (World of Mammals (Childs World))
Giraffes (World of Mammals (Childs World)) (World of Mammals)
Baboons (World of Mammals) (World of Mammals (Childs World))
Polar Bears (World of Mammals) (World of Mammals (Childs World))