Specifications:

• feature1: bird whistle
• feature10: bird caller whistle
• feature11: bird call
• feature12: bird whistles for adults
• feature2: bird call whistle
• feature3: birds chirping sounds whistle
• feature4: tweeting bird whistle
• feature5: fun bird whistle
• feature6: funny bird whistle
• feature7: bird whistle for fun
• feature8: practice bird whistle
• feature9: bird whistle for practice
• Hign-concerned Chemical: None
• Origin: Mainland China