The most widely accepted scientific explanation for cattle mutilations attributes the phenomenon to a combination of natural death, bloating, and scavenger activity that mimics surgical precision. When a cow dies in a pasture, decomposition gases cause the carcass to bloat, stretching the skin taut. Blowflies lay eggs in the body's natural openings — eyes, ears, mouth, anus, and genitals — and the emerging larvae consume the soft tissue from these sites first, creating openings that appear surgically precise to an untrained observer. Small scavengers (foxes, coyotes, ravens, magpies) preferentially feed on the same soft tissue sites, enlarging the openings.
The absence of blood is explained by post-mortem lividity and decomposition: blood settles to the lowest point of the carcass and coagulates, while dehydration and insect activity remove visible blood from exposed tissues. A 1980 investigation by the FBI, led by forensic pathologist Kenneth Rommel, examined 15 alleged mutilation cases in New Mexico and concluded that every case could be explained by natural causes. Veterinary pathologist studies have repeatedly demonstrated that the 'surgical precision' described by witnesses is consistent with the clean, straight edges produced by desiccated, taut skin splitting along natural tension lines.