The Case of the Heinous Slaughter

I have explained to you before that I am living at the residence of a self-styled farmer by the name of KB Forrest. He owns well over 100 acres of land infested with every manner of varmint. He admits this, yet refuses to find a more habitable location. This morning he went to feed animals, which he keeps for some sort of sadistic pleasure. He has furry rabbits, pigeons with tails like peacocks, and some with feathers sprouting in topknots from their heads. There are strange quail, ducks, chickens, peacocks, pheasants, and all manner of rare creatures that seem to have been bred by a madman.
In any case, when he returned to the house, I was foraging for a morning meal with my fledgling Tigran, who was tearing up a bag he found. I do not know what it contained. I noticed that the man, Forrest, looked dejected and unhappy. Being a good guest, I asked why? He said that although he had fortified the large cages thoroughly, something had magically entered one of them and had killed all of his beloved pigeons. The apparition, as he called it, had done other unspeakable damage. He asked for my help.
I followed him with Tigran loping alongside me. I saw a profusion of colorful feathers strewn about. It made Tigran hungry, but I cautioned him to refrain. A flayed skull of a bird was the first flesh I saw. Next, what was once a graceful white bird lay with its belly torn open and the ribs cleaned of flesh. A mound of bird legs and heads were in a corner, but mostly they had been simply killed and thrown to the side.
The most grotesque sight was the rabbits. They had been white with dark ears and a profusion of fur around the necks. He called them “lion heads.” Three of them had been attacked, but not killed. Two had missing eyes. All had been mauled about the face and were bloodied. I even saw one struggling to breathe.
“Why do you not put them to death so as to stop their suffering?” I asked. But I should have known that squeamish man would refuse, saying that he would try to save them. “Would you like me to kill them, then?” I offered, knowing that he was simply delicate.
“How could the creature have gotten in? There are no holes in the wire,” he asked, avoiding my question. “I have sealed off any means of entry!” he cried.
“I will investigate,” I said, thinking that if any evil were perpetrated in my area, I would not allow it unless it was my own. Sorcerers are quite territorial. I will investigate and tell you my findings.