sentences:  Foliage gleaning, the strategy of gleaning over the leaves and branches of trees and shrubs, can involve a variety of styles and maneuvers.Some birds, such as the common chiffchaff of Eurasia and the Wilson's warbler of North America, feed actively and appear energetic.Some will even hover in the air near a leaf or twig while gleaning from it; this behavior is called "hover-gleaning".