But! Without further ado, a flowchart of animal-themed books for kids aged 8 - 11 years.
These books are all chapter books, all have some illustrations/photos in them, and are great stories. Some I'd still double check what would be good for the right age (one might lend itself better to the 11-year-old than the 8-year-old). Some are classic, some are brand new. There's something for everyone, for sure.
Also, I have a link to download the printable poster: a pdf on Google Drive. It's sized 11" x 42" so you could, technically, print it on five landscape-oriented letter-sized pages. In any case, it's nice to have as a reference when recommending books!
Here's a full list of what's on the flowchart:

