sounds of passerine

Why do birds go crazy at sundown? Birds
Why do birds go crazy at sundown?
7
Why do birds gather and sing? Birds
Why do birds gather and sing?
14
What causes birds to sing? Birds
What causes birds to sing?
15
How do birds make friends? Birds
How do birds make friends?
12
Do birds sing because they are happy? Birds
Do birds sing because they are happy?
8
What is it called when birds sing in the evening? Birds
What is it called when birds sing in the evening?
19
Why do birds suddenly sing? Birds
Why do birds suddenly sing?
39
What does it mean when birds sing at night? Birds
What does it mean when birds sing at night?
64
What are two reasons that birds can produce great amounts of energy to fly? Birds
What are two reasons that birds can produce great amounts of energy to fly?
24
Why do birds sing vinyl? Birds
Why do birds sing vinyl?
58