Hornets are far more difficult and dangerous to control than paper wasps. The nests resemble a large, inverted tear-drop shaped ball which typically is attached to a tree, bush or side of a building.
Hornet nests may contain thousands of wasps which are extremely aggressive when disturbed. The nests are often located out of reach and removal is best accomplished by a professional pest control firm.
Baldfaced hornets may be best described as large, black and white, heavy-bodied wasps about ¾" long. They typically build exposed, mottled grey nests in trees or shrubs. Occasionally, the wasps will build nests under roof overhangs, in attics, crawlspaces and wall voids, or under decks or porches. The nests are constructed of a paper-like martial formed from chewed wood. The nests are often described as "football shaped", but they may exceed a basketball in diameter
this one under the roof overhang of house last year