This Red-winged Blackbird did not hesitate to let me know I was too close to the nest it was guarding.

This Red-winged Blackbird was speckled by snowflakes.
An epaulet wearing Red-winged Blackbird gleans the ground under the feeder.
A Red-winged Blackbird announces, for all to hear and heed, ‘My post! This is my post! Trespass at your peril!’
This Red-winged Blackbird closely watched me to ensure I did not approach too closely.