Crows can recognize geometric patterns, suggesting that humans aren't unique in understanding shape structure.

Then work through the page and see if you can beat your score. Parallel lines are the same distance apart from each other all the way along their length. Even if the lines are made longer ...

Crows in a lab were able to distinguish shapes that exhibited right angles, parallel lines, and symmetry ... Other critters might have an inherent sense of geometry, too, says Nieder, but until now, ...

Then work through the page and see if you can beat your score. Parallel lines are the same distance apart from each other all the way along their length. Even if the lines are made longer ...