Are sheep stupid?
No! Sheep have an excellent memory. They can remember faces of up to 50 fellow-sheep for up to two years1,2.
1Keith M. Kendrick, Ana P. da Costa, Andrea E. Leigh,
Michael R. Hinton, and Jon W. Peirce: Sheep don't forget
a face, Nature 2001 Nov;414(6860):165-6
2Keith M. Kendrick, Ana P. da Costa, Andrea E. Leigh,
Michael R. Hinton, and Jon W. Peirce: Sheep don't forget
a face, Nature 2007 May;447(7142):346
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