Red-necked Phalarope (breeding female)

I never thought I'd be this close to this species, but I was glad I'd packed my 25mm extension tube on this day! Originally content to stay 20 feet from me, the group of 8 phalaropes eventually disregarded my presence and swam to within 6 feet of my shoreline vantage. The extension tube allowed my lens to focus closer than it would have otherwise, and I was able to capture a series of full frame images from which I extracted this close=up headshot.

Hayward Regional Shoreline, Alameda County, California, 5/25/20
Canon 600mm f/4 IS II + 25mm extension tube on EOS 1DX Mark II
1/2500 at f/7.1, ISO 800