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Sheep
Collective Term
When talking about a group, use 'flock of sheep' instead of 'sheeps' since 'sheep' is both singular and plural. 
No Gender
Use 'sheep' for both male and female animals unless specifying with terms like 'ram' for males and 'ewe' for females. 
Wool Production
Sheep are often associated with wool, so phrases like 'sheep wool' are common when discussing clothing materials. 