Two black crows in a German lab have just shaken up what we thought we knew about animal intelligence. In a study published in 2025, carrion crows learned to spot a single odd shape hidden among five nearly identical ones. They did this even when the shapes were tricky quadrilaterals that humans normally meet in math class. For a long time, researchers suspected that this kind of geometric intuition belonged only to our species. So what exactly did the birds do? Perched in front of a touchscreen, each crow saw six shapes at a time. Five were the same. One was the intruder. When the crow pecked the odd one out, a feeder dropped a reward such as a mealworm. At first the differences were obvious, like a crescent among stars. Then the team at the University of Tübingen made the task much tougher with warped squares, skewed diamonds and other quadrilaterals that differed only in subtle angles and side lengths. Even on their very first encounters with these new quadrilateral sets, both crows chose the intruder far above chance. In a game where random pecks would be right only about one time in six, the birds landed on the correct answer close to half the time, and sometimes more. They also did better with very regular shapes such as neat squares and worse when everything was irregular. That pattern looks a lot like the way human volunteers respond in similar tests. For animal cognition researchers, there is an extra twist. Earlier work with baboons using related stimuli suggested that nonhuman primates did not show the same sensitivity to geometric regularity. Some scientists took that as a hint that intuitive shape geometry might be a human specialty. The new crow results suggest that bird brains, which lack a mammalian cortex,