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Sheep can become [[hefted]] to one particular pasture so they do not roam far from home. Since the outbreak of [[foot and mouth disease]] in the [[United Kingdom]], transplanted sheep have had to be trained to stay in their grazing area.<ref>{{cite web| url=http://news.bbc.co.uk/1/hi/england/1634526.stm| publisher=BBC News| year=3 November, 2001| title=Sheep taught to stay put| accessdate=2006-04-29}}</ref>
Sheep are also one of the many animals that can commonly display a preference for [[homosexuality]] (not with people) and are one of the few in which this occurence has been systematically studied. It occurs in about eight percent of rams on average. Its occurence does not seem to be related to dominance or flock hierarchy; rather the rams typical motor pattern for intercourse is merely directed at rams instead of ewes[http://www.ohsu.edu/news/2004/030504sheep.html].
[[Image:Lamb 09807-a.jpg|thumb|Lambs of some breeds are born with long tails which are cut off once they reach a certain age.]]
Sheep have horizontal slit shaped pupils. The narrower the pupil, the more accurate the depth perception of peripheral vision is; so narrowing it in one direction would increase depth perception in that plane [http://www.madsci.org/posts/archives/mar98/889495842.Gb.r.html][http://www.madsci.org/posts/archives/dec96/840904233.Zo.r.html]. Animals like goats and sheep may have evolved horizontal pupils because better vision in the vertical plane may be beneficial in mountainous environments[http://www.madsci.org/posts/archives/mar98/889495842.Gb.r.html].
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