The park that runs along the river in Renton has some lampposts that are made out of wood.  This is a nice way to provide something more in keeping with a park and it is a nice choice that they made.  It does mean, though, that the surface of the lamppost is a bit more amenable to wildlife getting established.  The damp weather that the Pacific Northwest is known for means that moss and lichens will find a place.  This they did!