We investigated how radar affects bird behavior using brown-headed นกวัว (Molothrus ater) by simulating two situations in which animals are exposed to radar at airports: stationary (e.g., surveillance radar) and approaching (e.g., aircraft weather radar). Under semi-natural conditions, we investigated the foraging and vigilance behaviors of นกวัว in response to stationary radar in two experiments. In a third experiment, we assessed cowbird escape behavior in response to an approaching threat (vehicle) fitted with radar.We investigated how radar affects bird behavior using brown-headed cowbirds (Molothrus ater) by simulating two situations in which animals are exposed to radar at airports: stationary (e.g., surveillance radar) and approaching (e.g., aircraft weather radar). Under semi-natural conditions, we investigated the foraging and vigilance behaviors of cowbirds in response to stationary radar in two experiments. In a third experiment, we assessed cowbird escape behavior in response to an approaching threat (vehicle) fitted with radar.