- Outside and inside giant squid, Sandra Markle
- The great rhino rescue, saving the southern white rhinos, Sandra Markle
- A mother's journey, Sandra Markle ; illustrated by Alan Marks
- Follow those zebras, solving a migration mystery, Sandra Markle
- Markle, Sandra, What if you had series
- Crocodiles, by Sandra Markle
- Hush up and hibernate!, by Sandra Markle ; illustrated by Howard McWilliam
- Growing up wild, wolves, Sandra Markle
- Musk oxen, by Sandra Markle
- Outside and inside birds, by Sandra Markle
- Outside and inside sharks, by Sandra Markle
- Markle, Sandra, Animal prey
- Outside and inside snakes, by Sandra Markle
- Wolves, by Sandra Markle
- Outside and inside kangaroos, by Sandra Markle
- The case of the vanishing golden frogs, a scientific mystery, Sandra Markle
- Mountain lions, by Sandra Markle
- Snakes, biggest! littlest!, by Sandra Markle ; with photographs by Joe McDonald
- Outside & inside killer bees, Sandra Markle
- Outside and inside mummies, Sandra Markle
- Outside and inside big cats, by Sandra Markle
- The case of the vanishing honey bees, a scientific mystery, Sandra Markle
- The search for Olinguito, discovering a new species, Sandra Markle
- Finding home, Sandra Markle ; illustrated by Alan Marks
- Tough, toothy baby sharks, by Sandra Markle
- Gone forever!, an alphabet of extinct animals, Sandra and William Markle ; illustrated by Felipe Dávalos
- Growing up wild, penguins, Sandra Markle
- Animal heroes, true rescue stories, by Sandra Markle
- The case of the vanishing little brown bats, a scientific mystery, Sandra Markle
- Wolverines, by Sandra Markle
- Race the wild wind, a story of the Sable Island horses, Sandra Markle ; paintings by Layne Johnson
- Lions, by Sandra Markle
- Markle, Sandra, Sandra Markle's science discoveries
- Snowy owl invasion!, tracking an unusual migration, Sandra Markle
- Creepy, crawly baby bugs, Sandra Markle
- Slippery, slimy baby frogs, Sandra Markle
- Outside and inside alligators, by Sandra Markle
- What if you could sniff like a shark?, explore the superpowers of ocean animals, by Sandra Markle ; illustrated by Howard McWilliam
- Tarantulas, supersized predators, by Sandra Markle
- The great penguin rescue, saving the African penguins, by Sandra Markle
- Markle, Sandra, Animal predators
- What if you had T. rex teeth?, and other dinosaur parts, by Sandra Markle ; illustrated by Howard McWilliam
- Tasmanian devils, Sandra Markle
- Outside and inside bats, by Sandra Markle
- Jackals, Sandra Markle
- What if you had an animal tail?, by Sandra Markle ; illustrated by Howard McWilliam
- Outside and inside dinosaurs, by Sandra Markle
- Markle, Sandra, Animal scavengers
- Little lost bat, Sandra Markle ; illustrated by Alan Marks
- Porcupines, by Sandra Markle