A few Bald-faced, Yellow Jackets and European hornets do little harm to healthy colonies. They can smell distress, though, so if a colony is dying…sick and/or Queenless…they’ll be there in a heartbeat. Now Yellow-Legged and Giant Asian Hornets are a whole different kettle of fish altogether. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.