At left is a photo from "Maggots, Mutilations and myth: Patterns of postmortem scavenging of the bovine carcass" by P. Nick Nation (Animal Health Division, Alberta Agriculture) and Elisabeth S. Williams (Wyoming State Veterinary laboratory, University of Wyoming), Canadian Veterinary Journal, Volume 30, September 1989, pp. 742 - 747. The article, and the conclusions of the authors, is referenced in the film.
Here's a quote from the article, which is a must-read for anyone who is interested in the subject:
"A characteristic of coyote feeding is the careful and clean manner in which the hide of a carcass is peeled from the meat, leaving a white patch of subcutaneous tissue. The skin is left virtually intact and there is very little tearing or shredding. Similarly, there is a very neat appearance to the skin wound produced by coyotes during their feeding. In contrast, they leave ragged edges on the underlying muscle and tendons. Coyotes pull off mouthfuls of food without bracing their feet against the carcass."
The authors conclusions?
"The parts reported missing from mutilated cattle are the same as those known to be removed by scavengers, primarily coyotes and birds, in the early stages of scavenging a carcass."
It is a conclusion, based on rigourous scientific research, that the mutologists rarely, if ever, reference.