What do you think of it? Personally I believe no little gray men are involved but the worldwide activities of whoever's responsible are a little disquieting to say the least.
Let's go over some cases.
In 1950's there were two different waves of cattle mutilations in the Ybitimi region, Paraguay. In both cases about a hundred cows, bulls and calves were found death over a period of eight months. Nothing was taken except for the tongue.
This case was related to Bernard Heuvelmans by Henri Pitaud, a French diplomat in Paraguay: at first Heuvelmans tried to relate the case with local legends about ogres called "vasitri" and "curinqueans" but then he left them apart when it became clear that even if a ogre was responsible he should be armed with surgical instruments and precise anatomical notions.
In 1977, from April to September, hundreds of sheep were killed in the Vosges region, France. Very little meat was taken: again the killer seemed more interested in blood and specific parts. All the searches were fruitless and in the end all the blame was put on a solitary wolf... too bad the last wolf in France was killed in 1927.
A number of inquires (for example "Animal Mutilations: What We Know and What We don't Know" by George Onet) turned out a number of interesting facts. For example in some cases the so called Rokitansky procedure had been used: the Rokitansky procedure is a standard autopsy practice in which the viscera are removed as a single unit. In a couple of cases very "terrestrial" items were found near the dead animals: a surgeon's knife (which turned out to be a "piece of militar surplus"), an large gauge hypodermic needle, a military surplus bag.
In the few cases in which toxicological tests were run heavy concentrations of commercially available veterinarian drugs were found, mostly tranquillizers.
Also reports of "unmarked" and "quiet" helicopters and other unidentified aircrafts have come from these areas of "high strangeness": I remember seeing a blurry photo which seemed to recall an helicopter with couter-rotating propellers, perhaps a Kamov design. Nick Pope, the famous MoD man involved in the crop circles investigations, openly said last year "NATO has some interesting aircrafts you won't be seeing at Farnborough next year".
What do you reckon?
"Louhi spoke in riddled tones of three things to achieve: find and catch the Devil's Moose and bring it here to me. Seize the Stallion born of Fire, harness the Golden Horse. He captured and bound the Moose, he tamed the Golden Horse. Still there remained one final task: hunt for the Bird from the Stream of Death"
-Kalevala, Rune XIII-