Deer engaging in strange behavior may be a sign that some of the animals across Nebraska have a disease, and the State Game and Parks Commission wants to know what it is. It's asking hunters who witness the behavior to contact the nearest commission office.

Deer have been seen walking around in very tight circles. Some deer have been showing no fear of humans. Game specialists warn hunters who see this in an animal that it should not be taken. Sick deer have been reported across Nebraska over the past few years but officials are still trying to determine exactly what it is.

The illness appears in white-tailed deer, but seems to be more common in mule deer.