I guess what just surprised me was crows would be that alert when they really have the advantage on us when it comes to escaping and being aware from having the high ground and ability to fly (well unless a person is hunting them, which is unlikely in a city). That combined with their communication with each other of potential threats.

I grew up on a farm around lots of wild animals and you're correct about rabbits though from my times of trying to catch them or saving baby bunnies from the cats. They're very observant, but I always figured they had much more reason to be from being alone and also limited to the ground without the ability to climb trees.

I've seen some birds that have little awareness (mourning doves and some sparrows). Sometimes they don't even realize you're almost on top of them until you're right next to them and then they freak out and fly away.

Same way cats can detect whether you focus your attention at them or not.

Eyes are very popular organ and seeing eyes and recognizing what they are looking at is very useful skill. I think animals get this skill as soon as they have enough physical computing power to achieve this task.