Montana's state veterinarian says most Yellowstone National Park bison have been pushed back into the park before cattle are expected to return to the West Yellowstone area Saturday.
Veterinarian Martin Zaluski said Friday that about 35 bison remain in an area near the intersection of Highways 191 and 287. That's more than five miles from where the cattle were due to arrive.
State and federal officials try to keep bison and livestock separate to prevent the wild animals from potentially transmitting the disease brucellosis, which can cause pregnant animals to miscarry.
Zaluski said about 280 bison were driven deep into Yellowstone's interior in recent days, following repeated efforts to get them to stay in the park. Efforts to move the remaining animals will resume next week.