Common moorhens (Gallinula chloropus), boat-tailed grackles (Quiscalus major) and red-winged blackbirds (Agelaius phoeniceus) were collected monthly from September 1984 to August 1985 at a waterhyacinth (Eichhornnia crassipes) infested lake in northcentral Florida. Contents of esophagi and gizzards were examined to assess predation on waterhyacinth weevils, Neochetina eichhorniae and N. bruchi, and other aquatic insects. Waterhyacinth weevils were rarely found in stomach contents of common moorhens, whose herbivorous diet consisted largely of coontail, hydrilla and duckweed. Although diets of the other two bird species varied seasonally, both consumed significant proportions of aquatic insects. Adults of Donacia leaf beetles were found to be very abundant in stomach contents of grackles and blackbirds (aggregate percent: @?x = 17.2, @?x = 26.9, respectively). Neochetina weevils were frequently found in gizzards of boat-tailed grackles and red-winged blackbirds (percent occurrence: @?x = 52.5, @?x = 41.5, respectively), but accounted for a relatively small proportion of the total diet (aggregate percent: @?x = 1.0, @?x = 6.3, respectively). Implications for biological control of waterhyacinth are discussed.