sentences:  These same traits are useful for gleaning the sides of buildings, as well.Another kind of rocky habitat is found along mountain streams, where birds such as the Louisiana waterthrush of North America and the forktails of Asia pick over stream-side rocks and exposed roots for aquatic insects and other moisture-loving prey.Foraging for invertebrate prey on the ground often involves gleaning the leaf litter of the forest floor, sometimes flicking, flipping, or scratching through dead leaves.