Large equipment like fans could generate such frequencies. As they&#x27;ve been linked to ghost sightings in humans, I wouldn&#x27;t be surprised if chickens got spooked by a similar effect:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Infrasound#Suggested_relationship_to_ghost_sightings" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Infrasound#Suggested_relations...</a>