Cat Tales is the first of a series of kid-friendly collections of animal stories and non-fiction. There'll be one or two grade-school-level texts on the animal, with eight-nine fiction works. Source for these is Project Gutenberg. (Summary by BellonaTimes)
How it works:
1. Register a free 1 month Trial Account.
2. Download as many books as you like (Personal use)
3. Cancel the membership at any time if not satisfied.