Deer fled human voices 64% of the time, then learned to ignore them
A 2025 study reveals that while human shouting is an effective deterrent for deer and elk, the animals quickly habituate to the sound over time. Researchers found that combining audio cues with visual stimuli like flashing lights significantly increases the effectiveness of these deterrents.
Why it matters
Understanding animal behavior in response to human-made deterrents is crucial for agricultural management and reducing human-wildlife conflict in rural areas.
What scares a deer away from a crop field, a wolf howl, a cougar call or the sound of a human shouting? A 2025 study by researchers from the University of Alberta and King’s University found that, among the sounds tested, human shouts produced the strongest flight response in both deer and elk. But the effect did not last: over six weeks, both species became increasingly accustomed to the stationary deterrents. The study, published in Ecology and Evolution, tested audio and flashing-light deterrents on agricultural fields in British Columbia’s Cowichan Valley, where Roosevelt elk and black-tailed deer frequently enter crop fields and can damage crops and fences.Human shouting worked better than predator callsBetween August 4 and September 17, 2023, researchers placed motion-activated devices on 15 crop fields.
Get smarter about the news
Sign up free for a feed built around what you actually care about, Dive Deeper research on any story, and the full text of every article.
Create free accountAlready have an account? Sign in