Thanks for looking. Yes these are cropped quite a bit, and probably a bit of shake as well, used relatively low ss iirc. For the high ISO shots I did some global noise reduction which probably lost some detail as well. Will revisit when I have time.
Thank you, Yes and it was cheeping through that full mouth as well. I guess it wanted to lead me away from the nest. I could not see the nest, but suspect it was in a dense thicket close to the path.