This should fill your grody book quota for the week. While Amazon’s page offers a tidy explanation of the book’s queasy contents, I rather prefer the synopsis on sillasstoys.com.
Owl Puke – The Book is a kit that contains everything you need to learn about the wonderful world of owl puke. Owls eat small rodents and then throw up the indigestible parts in a fuzzy pellet. With the guidebook in hand, you can inspect the professionally collected and heat-sterilized pellet for the bones of the animals that the owl has eaten. A plastic sorting tray is also included. A great science experiment!
Perhaps they will send me one for “review.”
subhumanzoids 
Dude, I used to love screwing around with owl pellets as a kid.