You head to work early and already you can hear them – those birds aren’t just awake, they’re already whooping it up with their melodies.
Singing Birds Stock Photos and Images - 123RF
Bird melodies sound sweet, but there's meaning to the music
Why do birds sing in the very early morning? What are they maybe communicating and to who and why? - Quora
/gcdn/authoring/2017/03/04/NTNH/
Wild Birds Unlimited
Wild Birds Unlimited, Hobby Store
Ten Backyard Bird Songs – Nature in Novato
Why do birds sing in the morning? - Plantura
Loh Down on Science: Special Pandemic Edition on Apple Podcasts
Why Do Birds Chirp in the Morning? 5 Surprising Reasons