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Sheep can recognise other sheep from pictures

source: New Scientist November 10 2001 p27

Sheep are able to recognise other sheep from pictures, according to Cambridge University researchers. They showed pictures of sheep’s faces to sheep they were training, and gave them rewards if they went towards the correct pictures. The sheep’s brains showed activity similar to that found in humans on recognising familiar faces, and there was no such response to stranger sheep. The sheep were able to recognise other sheep from pictures two years after they were initially trained. This research was reported in Nature, vol 414, p165.
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