Owls swallow their prey whole or in large chunks and they cannot digest bones, claws, fur, ect. What they can't digest they regurgitate in pellet form. These are collected & sterilized. Pellets are an excellent resource for ethically sourced bones, learning/teaching about food chains or just a weird little treasure hunt. The bundle includes 10 pellets, a bone identification chart and 2 display boxes. The individual is for a single pellet & a bone identification chart. 10 pellets includes 10 pellets & a bone identification chart.