Okay, I'll hold up my hand and say that I am a witch. Seriously. Lifelong Pagan Witch. There's someone else on this board who'll vouch for the fact that I'm not winding you all up
And I know witchcraft and I know other witches and I'm telling you: there's no animal sacrifices carried out. The police who blame animal attacks on witches because of the time of year etc, are talking b*****ks. They'd be just as accurate to tell you it was an alien attack. There is no "Pagan" time of year, ALL year is Pagan time of year. Just as it is Christian time of year, or Jewish, or anything else. The whole year has festivals of importance to all faiths, so to say that any time of year is "pagan" and therefore more likely to have pagan activity, is, quite frankly, nothing more than lazy policing and an attempt to fob you off. And, since it was on Ronaldsay, I'll stick my neck out and say that I know the police up there are more than happy to use witchcraft for almost any crime
Ask any Pagan (and I can point you to quite a few places in real life and online you could ask them) and they'll tell you that animal sacrifice and mutilation is an absolute abomination and the work of a sick person. Nothing more supernatural than that.