I was able to catch this little fellow just after he launched from the top of a bush. I believe it's an immature gold-crowned sparrow.
The Nikon Z7 focus tracking actually more-or-less nailed this one. I think it helped that he had landed just 15ft/4m from me so this is almost a full-frame shot. It is a 1.96x (linear) crop from full frame (300mm + 1.4x tc), so the effective focal length is 823mm. It's ISO 3200 from a raw file cleaned up in Lightroom.