Animals in a pen
Pen of animals is fenced
Fence of pen has sticks
a long wooden fence
a large dry field
Animals in a zoo
Fence of zoo is made of wooden sticks
animals in a field
zoo animals in an enclosure 
four animals in a fenced in area
a fence made of logs
the animals are in a zoo
the photo is black and white
there are two zebras in the zoo
the fence is wooden
a wooden fence
a giraffe, zebra and ostrich walking in fenced in enclosure at zoo