Big bison observation # 5: They're even hairer than I thought

One of the bison (closest to the photographer) in the process of molting her winter hair.

With the spring weather getting increasingly warm the even more rapidly growing bison have begun molting their winter coat of dense hair.  Now they aren't just leaving a few hairs on everything they touch.  They are actually leaving larger objects, such as tree trunks, wrapped in a layer of hair. 

One of the "rubbing posts" I had installed in the pasture. 
A closeup on the post, which is covered in a layer of bison hair.