Why do birds have different songs? #AskBillOddie

Bill Oddie explains why birds have different songs, and if they can understand each other #AskBillOddie.

@HotTeaOnAHotDay #AskBillOddie question: "My 9yr old would like to know why different birds have different songs, and can they understand each other?"

https://www.youtube.com/watch?v=8WYOdGoXP-M https://www.youtube.com/channel/UCMOHT2jWd3jJlZ7bw1cx7jQ/videos?view=0&shelf_id=1&sort=dd