Over 100 horses have been gathered as part of a roundup in northwest Colorado's West Douglas Herd Area.
The Bureau of Land Management says as of Sunday, 133 horses have been gathered since the roundup began on Wednesday.
The BLM also reported the first death of the operation. A horse being loaded onto a trailer to holding corrals fell and was stepped on by another horse on Sunday, breaking its neck. The BLM estimates the sorrel stud was between 10 and 12 years old.
A federal judge allowed the roundup to start following a legal challenge from horse advocates, calling potential harm from the roundup "minimal."
The agency is working with a contractor to collect 167 horses.
The West Douglas Herd Area is in northwestern Colorado, 50 miles north of Grand Junction.