(Length: 1/2 – 3/4″) Can be found in a variety of colors from reddish brown to dark red to orange with varying bright stripes of yellow and red. Paper wasps are predators and feed on insects, spiders and caterpillars. They build nests of paper-like cells that are usually attached to the underside of a support (i.e. an eave, window, etc.) and hang down. They are very protective of their nests and will defend against invaders with a painful sting.