several sheep standing in a pen
the black heads of several sheep
A flock of sheep have tags in their ears.
A flock of sheep are behind a fence.
4 sheep are reacting attentive.
sheep in a pen
a herd of sheep are in an enclosure
the sheep have black legs and hooves
the heads of the sheep are black
the herd of sheep has white wool
a fence is behind the sheep
small herd of sheep 
sheep looking in same direction 
a herd of sheep standing next to a fence in an enclosed area