Birds sing the most about an hour before dawn, when the air is at its stillest. Theoretically, this enables sounds to travel farther, making song up to 20 times more effective than if sung at midday.

Waking up to the dawn chorus of birds — one of the natural world’s greatest symphonies — is a joy like no other. It’s not surprising that bird-watching has become an increasingly popular hobby. A ...

Each spring, birds across America are in full voice. Cardinals chatter, sparrows sing and warblers warble. Birdsong lifts the ...