Merlin Bird ID (iOS)
Used by 4 peopleapps.apple.com ↗

“The Merlin Bird ID app is an absolute must have and if you aren't into birds you will be after spending a week with that app.”
Noah Kalina Interview, Artist, photographer · via Uses This 
“And I make very little use of apps on my phone or iPad (except for Merlin Bird ID, produced by ornithologists at Cornell, to identify birds) largely because my love of learning new things doesn’t seem to extend to technological tools.”
Ben Wurgaft Interview, Writer, historian · via Uses This 
“I think paper guides are still ahead of phone-based ones for now (aside from Cornell Lab of Ornithology's Merlin app for North America).”
David Lawrence Miller Interview, Ecological statistician · via Uses This