I bought this for my 11 year old Granddaughter for Christmas. The description on the Amazon site made it sound a bit more "adult friendly" than it really is. It does have good information on many many species of animals but it is geared for children. I was hoping it was more "encyclopedia" like, as she reads at an adult level. I'd say for a 7-10 year old this is a good book, but not for older than that.