Stock photography, photos: Ornithologist Stock photos of Ornithologistworking with immature tree swallow Iridoprocne bicolor Photograph: © John T. Fowler Click for a larger image and more information Keywords associated with this stock photo: Ornithologist, monitoring, growth, young tree swallow. Wings, painted, identification, purposes, migratory, songbird, song bird, vertical, science, scientific, research, study, experiment, pesticide, Iridoprocne, bicolor