(Warning: some of the video is a little disturbing.)

"I saw a buzzard flying and I thought she might be down or dead,” said farmer Gayland Jones.

That's what first gave Jones a reason to worry. He thought perhaps the one sick cow that he owns had died. But that wasn't the case.

"You can see right here the way the knife mark cut it and left the flesh like you would skin a piece of meat out,” he said.

His best head of cattle was killed. Jones had stumbled upon the same sight that he's seen periodically since the mid-‘90s: one of his Black Angus mutilated.

"It had some cutting on its mouth and tongue and on its back end."

With no way to explain it, other than a long-adopted theory that Jones doesn't buy.

"That's a theory that's always went around here: it's aliens."

“Myself, I don't believe in aliens, but who knows?" said Wright County Sheriff Glen Adler.

This is about his 20th head of cattle killed in the same way, all on Jones' property. Jones says he thinks his cattle are being targeted. He had one killed Thursday night. In August, he had another one killed on his farm a mile and a half away.

Adler is trying to figure it out, just as many sheriffs did before him.

"In 2004, a retired officer worked two or three cases that were basically the same thing,” the sheriff said.

It’s all a mystery. There is little to no blood to show.

"It was just like a round perfect circle when they take the udder off,” said Adler.

"We don't know. Is it a cult? Someone wanting to make it look like one? Is it animals? I just can't see even a pack of dogs taking a cow down without cutting them up.

"They knew how to use a blade or a surgical knife, whatever they used.. They were good at it,” said Jones.

Jones says it takes a lot to scare him. He's getting there now with this.

Anyone who can help the Wright County Sheriff's Department with its investigation can call (417) 741-7576.