Tree, Tree Trunk, Utility Pole, Wood, Animal, Bird, Vulture, animal, backdrop, background, bark, beautiful, beauty, biology, bird, birding, branch, calm, cavities, concepts, conceptual, conservation, day, dying, ecological, ecology, environment, environmental, forest, gray, grey, holes, horizontal, life, limb, natural, nature, notchings, organic, ornithology, outdoors, outside, peaceful, scene, scenery, scenic, science, tree, wild, wilderness, wildlife, woodland, woodpecker, woods, zoology, outdoor, achiever, fertilizer, piciform bird, pit, skill, discipline, twenty-four hours, end, composure, direction, life science, improvement, woody plant, wood, vegetation, division, plant, opening, stage set, disposition, disfavor, rejection, hole, conception, transformation, person, calmness, situation, fauna
Woodpecker notchings and cavities in a dying tree