Love that eye. Knowing you aren’t a bird photographer, I too wonder how close you were? I have a 75-300 zoom which does a fair job in the right conditions. I can see me getting a similar shot if a particularly stubborn nesting bird let me get to 5′ or so.
Flat Earth Luddite
Late response but freaking great! I especially like that she wasn’t scared off her nest (although I’ll bet it was a near thing). Seriously awesome awesomeness!!