Article: This Hilarious Optical Illusion for Birds Could Save Your Life
https://gizmodo.com/this-hilarious-optical-illusion-for-birds-could-save-yo-1829716568Paper: Wide-eyed glare scares raptors: From laboratory evidence to applied management
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0204802Both static and moving stimuli were used to scare the raptors, but only the looming eyes had the desired effect.
Image: M. Hausberger et al., 2018/PLoS One
a) test apparatus; b) birds (in percent) that reacted to the display of the visual stimulus. c) stimuli: LE: looming eyes, LTS: looming turning spiral (as used on some aircraft), LMS: looming moving spiral, LBD: looming black disc, FBD: static black disc, F Sph: static geometric shapes: sphere (depth impression), S: stripes (used for repelling birds from windows) [35], Fstar: static star, C control: grey screen. Chi-square test, * p < 0.05.; c) The stimulus displayed: LE: looming eyes, looming turning (LTS) versus moving (LMS) spiral, looming (LBD) versus static (FBD) black disc, static geometric shapes: sphere (F Sph), strips (S) static star (Fstar) and control (C).