Scientists played human shouts, wolf and cougar calls near British Columbia crop fields; deer fled 64% of the time from human voices, but quickly learned to ignore the deterrents

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