Dawn Chorus
Etymology
A plain English pairing of "dawn" (from Old English "dagian," to become day) and "chorus" (from Greek "khoros," a group of singers and dancers). Naturalists adopted the phrase to describe the seasonal peak of collective birdsong at daybreak.
noun phrase · /DAWN KOR-us/
The wave of birdsong that rises together in the hour around sunrise.
What it names
A specific, fleeting daily event — the loud communal singing birds do at first light and rarely again.
Example
She woke early on purpose, just to catch the dawn chorus in May.
Related idea
The dawn chorus is the morning surge; birds also sing a quieter, shorter dusk chorus as the light fades.