[A female cerulean warbler is perched in a tree. She hops from branch to branch while foraging by picking small insects off the tree.] [Explore Macaulaylibrary.org]End of transcript
While it may appear that this female Cerulean Warbler is feeding on plant matter, it is actually picking small insects from the tree using its small, sharp beak, a form of foraging known as foliage gleaning. The term gleaning can also refer to birds feeding on invertebrates from other substrates, including mites or ticks on the backs of other animals.
Recorded by Benjamin M Clock, Macaulay Library