Tagged: haze

Government officials plan haze a large herd of migrating bison back into Yellowstone National Park this week - an annual event that is again drawing opposition from wildlife advocates and American Indian groups.

Montana state veterinarian Marty Zaluski says an estimated 400 bison are outside the park in the West Yellowstone area. Government workers could start driving the animals back into Yellowstone using a helicopter as early as Wednesday.

Hundreds of bison leave the park annually during winter to graze at lower elevations.