“The birds sing each morning as they know they have another day to live. Life and mornings are a gift.“ – Unknown

Despite the still-cold temperatures, birds are beginning to think it’s spring.
Surely You’ve noticed birdsong in the morning. Science calls this the “Dawn’s Chorus’.
It starts just before Sunrise and last several hours. Birds can all the time, however during the dawn chorus their songs are often louder, livelier, and more frequent.

But why choose the hours around sunrise to sing? There are a number of theories, and they’re not necessarily mutually exclusive.

One idea is that in the early morning, light levels are too dim for birds to do much foraging. Since light levels don’t affect social interactions as much, it’s a great opportunity to sing, instead.

More Here at Wired.com