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The Gleaners (Birds are the natural)
Birds are the natural conservators of our trees. One of their chief offices is the destruction of insects whose ravages destroy the foliage or eat the very hearts out of our shade and forest trees.
Chief among the gleaners of the foliage are the warblers Fig. 169. Black and White Warbler entering its nest. and vireos; they search the trunks of trees, peer in all the crevices and hang from the tips of the slenderest branches, devouring insect-eggs, worms, caterpillars, larvae and fully developed flies or moths. I have been very fortunate in being able to secure photographic histories of a number of these gleaners.
