Early this morning, around 4:15, long before the first hint of light dawned on my New Jersey backyard, I heard...tree swallows.
And they appeared to be flying around, foraging! I remember hearing barn swallows flying and calling in pitch darkness several years back too. I wonder what is going on? (A quick google search yields no answers.)
Feeding on moths? Early / late migration? I'm pretty sure they are mainly diurnal migrants. Who knows? Golondrinas de la noche.