science, radio, transmitter, solar, mallard, ornithology, waters, engineering,

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Keywords: air, antenna, behaviour, birds, chip, conduct, constance, district, ducks, engineering, fresh, funkente, gps, history, inland, lake, mallard, migrant, natural, observation, observe, ornithology, passage, peilgert, peilsender, peripherie, radio, research, revierverhalten, route, science, solar, transmitter, vogelbeobachtung, vogelzug, watch, watching, water, waterfowl, waterfowls, waters, wild, wildvogel