Recently I have noticed what appear to be approximately 10 or 15 paper wasps-legs hanging when airborne-flying up and down my side wooden paling fence. They only fly where there is direct sunlignt on the fence. Most of the fence is tree covered. As of yet I haven't found a nest on my property. I was wondering if this is a common activity with them. Maybe they are looking for insects or could they be collecting bits of paling for building a nest.