| Roving the Red Planet |
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| Ruby Bridges |
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| Ruby-Throated Hummingbird Migration |
|
3.7 |
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| Saber-Toothed Cat |
|
3.3 |
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| Saguaro's Gifts |
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| Sahara Desert |
|
3.4 |
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| Saltarines de alta velocidad (High-Speed Hoppers): Canguro (Kangaroo) |
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1.0 |
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| Sandhill Crane |
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| Sandy Feet! Whose Feet?: Footprints at the Shore |
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| Satellite |
Soon!
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| Saturn |
|
1.7 |
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| Save Amphibians |
New
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| Save Birds |
New
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| Save Carnivores |
New
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| Save Native Plants |
New
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| Save Ocean Life |
New
|
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| Save Pollinators |
New
|
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| Scaly Swimmers: Crocodile |
|
1.1 |
|
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| Science Investigations (8 titles) |
New!
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| Scorpion |
|
4.0 |
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