Registered birds include sparrows, grackles, storks, hummingbirds, eagles, herons, moorhens and egrets. Commonly sighted birds include ravens, robins, grackles, ruffed grouse, and great blue herons. Avian predators include American kestrels, Greater Antillean grackles, and pearly-eyed thrashers. During nesting, corvids, grackles, housecats, or rat snakes will prey on their eggs. Sometimes members of the starling family have historically been called grackles. Sometimes these are mixed flocks with other grackles, and sometimes they may include "Oropendolas". Emergent aquatic vegetation was commonly used for nesting amongst the Slender-billed Grackles. Grackles can be regularly seen foraging for insects, especially after a lawn trimming. Because of their loud vocalizations, great-tailed grackles are considered a pest species by some. Great-tailed grackles are noted for their diverse foraging habits. Grackles at outdoor eating areas often wait eagerly until an unwary bird drops some food. Like all "Quiscalus" grackles, it is a rather large, gregarious bird. Slender-billed Grackles inhabited marshes and borders of the lakes. Great tailed grackles have also moved in similar fashion northward. Great-tailed grackles have an unusually large repertoire of vocalizations that are used year-round.