State biologists are trying to unravel a mystery of what killed a herd of elk in northeastern New Mexico.
More than 100 elk found were dead on a ranch about 20 miles north of Las Vegas this week.
Sky News 13 flew over the gruesome discovery on the sprawling 75,000-acre Buena Vista Ranch near Mora.
The elk weren't shot, so the New Mexico Department of Game and Fish is investigating just what caused the deaths.
Their top suspicion: something called Epizootic Hemorrhagic Disease, or EHD. The often-fatal disease is caused by insect bites.
"With EHD, an elk could get a fever," said Game and Fish spokesperson Rachel Shockley. "It's usually a pretty fast illness, and up to eight to 36 hours later the animals go into shock, and then they die."