Join BirdNote tomorrow, November 30th!
Illustrator David Sibley and actor H. Jon Benjamin will face off in the bird illustration battle of the century during BirdNote's Year-end Celebration and Auction!
Common Swifts circling and calling
©
johnskovhus
"They often form 'screaming parties' during summer evenings where about 10-15 gather and fly around in circles, all calling out to each other. The call is a loud scream in two different tone pitches, of which the higher one is from the female and the lower one from the male."