Bison are not allowed to move freely outside Yellowstone due to fears by livestock interests that they might transmit brucellosis to cattle and compete with cattle for grass, as well as concerns for human safety and property damage. These fears have resulted in Montana legislation that prohibits moving live bison from the park to other conservation areas. For long-term conservation, Yellowstone bison need access to habitat outside the park, similar to other migratory wildlife like elk (another species that carries brucellosis).