Two Nevada men each face penalties of up to one year in jail and $100,000 in fines after pleading guilty to shooting five Bureau of Land Management mustangs in Buckhorn Herd Management Area in Nevada in November 2009.

Agency helicopter pilots discovered the animals' carcasses during a roundup of mustangs in a remote range along the Nevada-California border.

Federal authorities later charged Todd Davis and Joshua Keathley with maliciously causing the death and harassment of free-roaming horses by shooting them. The pair initially pleaded not guilty to the charges in April.

But on June 16, both men changed their pleas to guilty during an appearance in U.S. District Court in Reno