Over the years I have found signs of gnawing on my woodenware.  Example once
in the fall a few years ago I placed a rat stick in the wrong way leaving no
entrance. When I checked the colony in the spring I found my mistake, but
there was a entrance grawed through the rat stick.  I have also found signs
of grawing where the boxes do not meet well and the bees start using this
gap as an entrance.  Am I jumping to a wrong conclustion?

Bill Hughes
The Apiaries of Bill And Joyce Hughes