Simple tried and true method for skunks:  use wall-to-wall carpet "Tack
strip".  Comes in four-foot
lengths from any carpet installer.  A one-foot section tacked on the
outside edge of the entrance
with slanted nails pointed inwards will quickly discourage skunk
scratching, but will not impede
bee activity in the slightest.
 
P C Wilson, Wareham, MA [log in to unmask]