Studies conducted on pigeons in Jaipur city show that these birds can be used to measure city pollution, say researchers at the University of Rajasthan, in northern India.
Penelitian yang dilakukan terhadap burung - burung dara di kota Jaipur menunjukkan bahwa mereka dapat digunakan untuk mengukur polusi kota, kata para peneliti di University of Rajasthan, India sebelah utara.