sentences:  During the winter months, black-headed gulls from Siberia migrate to Green Lake and entertain the crowds of visitors as they circle around and snap up bread, usefully provided by a herd of local vendors, thrown up into the air by tourists.There are performances of pieces from Chinese operas and of folk music within and around the park.Located in the park is the statue of one of Yunnan's most famous patriots - Nie Er, the composer of China's national anthem.