Pellet Lab
Tease apart a virtual barn owl pellet, sort the jaws by their teeth, pair them up and chart the diet.
The simplest way to identify prey is to find the lower jawbones and pair up the left and right jaws; that also tells you how many animals were eaten. source Shrew jaws are easy to spot: common shrews have red-tipped teeth. source Vole molars are high-crowned with angular cusps; mice have low-crowned molars with rounded cusps. Wikipedia
How the pellets are made: each holds 4 or 5 animals source, drawn using the Barn Owl Trust’s diet figures (field vole 45%, common shrew 20%, wood mouse 15%) source. The remaining 20% is split evenly between bank vole, pygmy shrew, house mouse and brown rat. That even split is our simplification.