March 14, 1968, was an unusual day in Skull Valley, is what we're saying.
Don Grayston via Wikipedia
Well, it was pretty usual aside from this.
But, while Peck's day had started out weird, it was about to take a screeching turn onto Batshit Boulevard. Soon, an Army helicopter from the nearby Dugway Proving Ground arrived and dumped out a stream of military scientists, who collected creature corpses and jabbed Peck's rightfully terrified family with frightfully terrifying needles. They were gone as quickly as they had appeared, and, soon, rumors of bizarre military chemical weapon tests were running rampant throughout the community. The U.S. Army's official answer to such allegations was, "Nu-uh, but we'll pay for all your dead sheep, anyway."
Despite their denials, the Army had, in fact, released a heaping helping of the straight-up evil VX nerve agent from an F-4 Phantom jet over the Dugway test site on March 13, 1968 -- which you may recognize as the day before every sheep in the general proximity of Ray Peck just so happened to keel the hell over. Thanks to a janky shut-off valve, the plane continued to release the chemical as it climbed to a higher altitude after the test, scattering trace amounts of the lethal agent across the surrounding landscape.