Herd Management
The BLM manages free-roaming wild horses and burros on public lands as part of its multiple-use mission, with the goal of supporting healthy wild horses and burros on healthy public rangelands. The BLM is responsible for determining and maintaining appropriate management levels (AML) for each herd and works to achieve that population target through a variety of management processes, including limiting reproduction in some herds through the use of birth control and gathers that remove excess animals from the range.