MADISON, Wis. (AP) — Wisconsin wildlife officials say people may spot low-flying helicopters or fixed-wing planes buzzing around southern Wisconsin over the next few months.

The Department of Natural Resources is launching an aerial deer survey over the chronic wasting disease management zone. Surveys are planned to run through mid-January over eastern Rock and western Walworth counties. Flights also are set for western Dane and eastern Iowa counties as well as portions of Richland and Sauk Counties.

Helicopters are expected to fly about 100 feet to 150 feet above tree-top level. Fixed-wing aircraft will travel about 500 feet above the ground.

The surveys should be completed by mid-February. Information from the surveys will be used to help estimate deer populations.