The Christian Liberty Nature Readers series published by Christian Liberty Press provides a living-book way of exploring nature. The complete series runs from K-5. Whereas the later books in the series have been revised and edited, Books 1 and 2 are simply reprints of books now in the public domain.
Now you can add these popular living books to your homeschool bookshelf — free!

Christian Liberty Nature Reader — Book 1
Aka, Nature Stories for Young Readers: Animal Life by Florence Bass
Covers “mainly such insects or other animals as the children may observe for themselves,” such as wasps, spiders, honeybees, butterflies, mosquitoes, grasshoppers and other small creatures.
…[I]t is surely impossible to become acquainted, even in a slight degree, with these expressions of the wondrous thoughts of God, without being drawn nearer to their Maker and ours.
Free eBook:

Christian Liberty Nature Reader — Book 2
Aka, Nature Readers: Sea-side and Way-side No. 1 by Julia McNair Wright
Intended for beginning readers, covers crabs, wasps, bees, spiders and other creatures.
Free eBook:
Additional Resources
Nature
All of our nature study resources including many other free eBooks!