Ключевые слова: age, aluminum, animal, animals, aves, avian, band, banding, biodiversity, biology, bird, birds, blue, close, closeup, conservation, demonstration, detail, education, environmental, equipment, european, examining, feather, feathers, hand, handling, hands, holding, measure, measuring, migration, nature, ornithology, outdoor, outdoors, research, ring, ringed, ringing, science, scientific, serin, serinus, study, wild, wilderness, wildlife, wing, yellow,