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Editor’s summary Abstract Supplementary Materials References and Notes Information & Authors Metrics & Citations Check Access References Figures Tables Media Share This article has 0 eLetter . Editor’s summary Bird brains were once maligned, but it is increasingly clear that, although structurally different from mammals, they provide high-level analogous cognitive functions.
Abstract The perception of geometric regularity in shapes, a form of elementary Euclidean geometry, is a fundamental mathematical intuition in humans. We demonstrate this geometric understanding in an animal, the carrion crow. Crows were trained to detect a visually distinct intruder shape among six concurrent arbitrary shapes.
MATERIALS AND METHODS All procedures adhered to the National Institutes of Health’s Guide for the Care and Use of Laboratory Animals and were approved by the ethics committee and under license ZP 03/20 G by the national authority (Regierungspräsidium). Two male carrion crows (Corvus corone corone, crow 1: 11 years old, crow 2: 10 years old) were involved in this experiment. They were housed in social groups in large indoor aviaries.
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