I've been watching my neighborhood birds for a while now and they indeed have individual personalities. It's pretty cool to know for example when a neighborhood cat is approaching, how it's approaching (stalking or walking?), and even which cat it is all because the birds communicate it to each other.
Wow, so cool to see someone reference Jon Young on HN.
I was about 12 or so when was gifted a copy (is that an appropriate term for a cassette pack?) of Seeing Through Native Eyes[0], which I devoured. That led me to his book Advanced Bird Language[1], which blew my adolescent mind. I still have both, and a lot of the material has really stuck with me.
If you're interested in diving deeper into this bird world, I'd recommend starting with "What the Robin Knows" by Jon Young https://www.amazon.com/What-Robin-Knows-Secrets-Natural/dp/0...
Jon still does a lot of programs and workshops and research and it can be a fascinating rabbit hole to dive into.