Crows can recognize geometric regularity

This article has been reviewed according to Science X's editorial process and policies . Editors have highlighted the following attributes while ensuring the content's credibility: Intruder detection task. Two carrion crows were trained to detect an intruder stimulus in an array of six simultaneously presented stimuli. The crows initiated the trial by moving their head in front of the screen whenever a go-stimulus appeared. After a prestimulus period of 200 ms, an array of six stimuli was displayed. The crows responded by pecking on the intruder. In 50% of the trials, the crows were tested with non-quadrilateral background stimuli (top); in this example, the crescent is the intruder among stars. In the other 50% of the trials, the crows were tested with quadrilateral probe stimuli (bottom); in this example, a nonsymmetric quadrilateral is the intruder among symmetric quadrilaterals. Credit: Science Advances (2025). DOI: 10.1126/sciadv.adt3718 A trio of animal physiologists at the Uni ... Read full article.