sentences:  Gleaning, in birds, does not refer to foraging for seeds or fruit.Gleaning is a common feeding strategy for some groups of birds, including nuthatches, tits (including chickadees), wrens, woodcreepers, treecreepers, Old World flycatchers, Tyrant flycatchers, babblers, Old World warblers, New World warblers, Vireos and some hummingbirds and cuckoos.Many birds make use of multiple feeding strategies, depending on the availability of different sources of food and opportunities of the moment.