Duping a guppy is easier than duping a ring dove — at least when it comes to a classic optical illusion.
In the Ebbinghaus illusion, two identical circles placed side by side are each framed by a set of either smaller or larger circles. Human adults almost always perceive the circle ringed by smaller circles as the larger of the two options, previous research has shown. So do guppies. But doves are a more mixed bunch, with some showing guppy-level gullibility and others rarely falling for the trick, researchers report October 20 in Frontiers in Psychology.
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