I liked that little known animals were shown as belonging to the mammal group. There are also well-known mammals. I liked how where they lived was given along with what they ate. Then facts were given that maybe I knew but mostly were new to me. I appreciated when I was told when an animal was extinct in the wild but still alive due to protected areas/captivity. While I am not happy about the captivity, I am glad the animal (I'll let you learn which one it is) is not totally extinct. I learned a whole lot about these mammals and in a delightful way. Perfect for your 4-8 year old.