Ключевые слова: animal, asian, background, beautiful, beauty, bird, birds, blue, branch, chalcophaps, collection, color, colorful, common, communication, correspondence, couple, culture, document, dove, emerald, environment, fauna, flora, forest, global, green, grey, illustration, indica, message, nature, old, one, ornithology, pair, perforated, philatelic, philately, picture, pigeon, planet, retro, series, standing, thailand, tree, tropical, wild, wildlife,