The young males begin to grow their characteristic train at about eight months of age, but it is not until they are four years old that they attain the full male plumage
आठ महिन्यांनतर नर पक्ष्यांचा पिसारा वाढू लागतो. त्यांचा पूर्ण पिसारा वाढण्यासाठी चार वर्षे लागतात.