Clark County sheriff’s deputies are investigating a report of a masked man sneaking into a local dairy farm and sexually assaulting a calf.

The alleged sexual contact happened Nov. 1 at a barn among Battle Ground-based Andersen Dairy’s facilities on Northeast 162nd Avenue, sheriff’s Sgt. Brent Waddell said.

Video surveillance from the dairy farm shows a man walking into a barn. At one point, he ducks behind a bale of hay to hide from an employee. He puts on a mask, removes his pants and enters the pen of a calf, where he stayed for about 30 minutes, according to the sheriff’s office.

The dairy farm reported the sexual contact Nov. 16, when it reviewed security footage, Waddell said.

Deputies have not identified a suspect. They’re still working on obtaining and reviewing video, Waddell said.