that's a lot of loons at once! Must've been a spectacle - and loud?
Wow...I saw a flock of about half that on a backpacking trip along Lake Superior last summer and that took my breath away.
Sadly, I couldn't hear them at all.....it was a strong wind and/or they weren't vocalizing.
They were paddling from the relative calm of the harbour out into the rough lake....maybe more room to get up speed before flying away?