Some theories to uncover the reason birds practice their love songs outside of mating season.
Garden birds in January: winter survival - Discover Wildlife
Where Do Birds Sleep During Winter?
Why Do Birds Sing At Night?
Why Some Birds Sing in the Winter
Catch a Rare Sighting of the Brown Creeper
Why Do Birds Sing At Night?
Garden birds in January: winter survival - Discover Wildlife
Do Birds Get Cold Feet In the Winter?
Why Do Birds Sing At Night?
Why Some Birds Sing in the Winter
Why Do Birds Sing At Night?
Why Do Birds Sing At Night?