This is the original, uncropped image.
Taken with my P1000 at max zoom - 3000mm.
Let's assume the individual was 52 inches, or 132.08 centimeters tall, and 9.3 inches or 23.622 centimeters wide.
Can somebody do the "simple" trig that I am unable to perform and let me know approximately how far away that bird was from me when I took the shot?