Bloodthirsty Monsters!

My oldest (of three) sister dropped by this morning for a cuppa, and told me a tale of woe. Her grandson's pet rabbit, which he adored, had had its throat torn out by an unknown predator, and that he had suffered the shock of making the gruesome discovery himself, when he went out to visit the rabbit hutch yesterday morning. He was inconsolable, the poor little lad, and would only be slightly comforted by his grandfather's practical suggestions as to how vengeance might be sought against the perpetrator of this awful deed!
My sister was mystified as to how the beast had gained access to the inside of the well-built rabbit hutch. They looked all round it for a point of entry from above, below and round the sides and found none. They assumed that it had been a polecat (of which there are many in these islands) which had done the damage. But, I told her, several things suggested otherwise. Firstly, the fact that the beast had gone for the throat, and had apparently drained the unfortunate bunny of its life-blood. A polecat ferret only eats the liver of its prey, and liver is the bait one uses in traps for catching these animals. Secondly, the fact that there was no point of entry.
I think the culprit is the "whitrit", as the weasel is called here. It is a much smaller and thinner animal, and would be able to enter the hutch through the chicken-wire mesh. It is also more bloodthirsty.