The natural cause explanation for cattle mutilations rests on well-established veterinary science and has been endorsed by the FBI, multiple state investigative agencies, and the majority of veterinary pathologists who have examined mutilation cases. The argument is straightforward: cattle die of natural causes (disease, lightning, poisoning, complications of calving) in remote pastures. In the hours and days following death, bloating stretches the hide taut. Blowflies preferentially lay eggs in the body's natural openings — eyes, ears, mouth, nostrils, anus, and genitals — and the emerging larvae consume soft tissue, creating openings that expand as scavengers (coyotes, foxes, ravens, vultures) exploit them.
The resulting pattern — selective removal of soft tissue from specific body sites, with clean-appearing wound edges — mimics the 'surgical precision' described in mutilation reports. The absence of blood is explained by post-mortem settling and coagulation. Controlled studies have demonstrated that all features of classic cattle mutilations can be reproduced through natural decomposition and scavenger activity.
The natural cause explanation is simple, parsimonious, and supported by experimental evidence — but it has never satisfied the ranchers who find the carcasses.