By Gavia Aquila and Matthew A. Young:A few weeks back when we knew an epic finch flight was on our doorsteps, there was increasing discussion about finch flight calls and how tricky they can be to ...
#Pine Siskin
Irruption Alert: Astonishing Pine Siskin Nocturnal Migration
By Ryan F. Mandelbaum: On Sunday, October 11, Astronomer and Field Ornithologist Timothy Spahr captured sounds almost never heard in recorded history: the raspy call notes of Pine Siskins migrating at ...