Bird, Swallow, alive, animal, Aves, background, beak, bill, biodiversity, biology, bird, birding, birdwatching, blue, brown, cliff, colony, conservation, couple, day, ecology, environment, environmental, fauna, feathers, flight, flying, horizontal, life, living, mud, natural, nature, nest, organism, ornithology, outdoors, outside, pair, passerine, red, science, songbird, swallow, two, vertebrate, warm-blooded, white, wild, wildlife, zoology, running away, outdoor, taste, soil, life science, achiever, set, earth, escape, writing, skill, settlement, gathering, discipline, twenty-four hours, dissimilarity, travel, direction, air travel, improvement, 2, crimson, aves, feather, oscine, body, passage, mouth, difference, nonuniformity, class, orifice, heterogeneity, diverseness, experience, transformation, person, situation, document
Two cliff swallows (Petrochelidon pyrrhonota) from the same colony fighting