Mockingbird, probably.
The mockingbird in my backyard would *perfectly* mimic the audio crosswalk signals for the street behind my house. Timing and everything. The only hint it was the bird was that it wouldn't go the full 20 seconds, and would sometimes randomly switch to generic bird tweetery midway.
I was waiting for the day some poor blind fuck got murdered by a bird.

>>2140065
You live in Nebraska but specifically Massachusetts? What the fuck?!!?!

>>2140065
Nothern cardinal maybe? I always thought they sounded like some sort of video game. ~30 seconds into this video:

https://www.youtube.com/watch?v=buo5h5lLcpw

>>2140111
this is definitely one of them. The other one is wicked fast, literally a pewpewpew.

>>2140118
I should've posted a better video, my bad. The video I linked earlier is the 4th call in this one. The other three are faster.
https://youtu.be/3dLaeG6WCj0

>>2140126
yep that's it. Those little fuckers sound like there at war, I love it.