Evaluation of two unmanned aircraft systems as tools for protecting crops from blackbird damage

Lucas J. Wandrie, Page E. Klug, Mark E. Clark

Research output: Contribution to journalArticle

4 Scopus citations


In response to a need for mitigating blackbird damage to crops, we evaluated the effectiveness of two unmanned aircraft systems (UAS or drones) to protect crops from blackbird damage. UAS are known to elicit behavioral and physiological responses in wildlife and have been proposed as a means to protect row crop agriculture from avian pest depredation. We evaluated the behavioral responses of captive and free-ranging red-winged blackbirds to a fixed-wing and a rotary-wing (multi-rotor, quadcopter) UAS by comparing preflight behaviors to behaviors during UAS approach. Due to the flight limitations of the respective UAS, the fixed-wing and rotary-wing were evaluated at different altitudes. Behavioral responses of captive and free-ranging blackbirds to approaching UAS were categorized as no response, alertness, or attempted escape/flight. Neither captive nor free-ranging flocks of red-winged blackbirds displayed behavioral responses to approaches by the fixed-wing UAS when flown at or above 52 m above ground level (AGL). However, both captive and free-ranging flocks exhibited behavioral responses to the rotary-wing UAS when flown within 30 m AGL. Behavioral responses of blackbirds to the rotary-wing UAS were more pronounced with lower altitude approaches. Our findings suggest that UAS have the potential to modify blackbird behavior in a way that may reduce sunflower crop depredation.

Original languageEnglish (US)
Pages (from-to)15-19
Number of pages5
JournalCrop Protection
StatePublished - Mar 2019


  • Frightening devices
  • Human-wildlife conflict
  • UAS
  • Unmanned aerial vehicles
  • Wildlife damage

Fingerprint Dive into the research topics of 'Evaluation of two unmanned aircraft systems as tools for protecting crops from blackbird damage'. Together they form a unique fingerprint.

  • Cite this