The sparrows might know that Emma could not break the glass, so they colluded and came to tease Emma every several days. Emma always fell into their trick. Every time when the sparrow flied near to her and sang songs, she would be anxious to catch it. As she was stopped by the glass, she could swing her tail only to express her anxiety and occasionally sounded ‘Humph’! The pair of ‘enemies’ in the nature would continue to act like this. Hope they can keep being peaceful~