Two of the most common skulls that I find are deer and sheep. There's huge variation in different types of deer and breeds of sheep - but there are some rules which can tell you which are which.
They can look very similar, because they are both herbivores with eyes on the side of their heads. So, I'm going to take you how to tell the difference between the two skulls, even if you only have a small fragment of the skull. In all of this I'm using a red deer skull, as the bigger UK deer (red, sika, fallow) are closer in size to sheep than the smaller deer (such as Chinese Water Deer, muntjac and roe) and fragments can be mistaken for sheep...read on to find out more !