On my way home, I stopped off at Paul Rushing / Chain-of-Lakes Park. Most of the shorebirds had left, except for a few Yellowlegs and Black-necked Stilts, a single Marbled Godwit and a solitary Wilson's Phalarope.
There were Whistling Ducks on the far side of some of the lakes but too far away to see clearly. Suddenly, something spooked them and they all took off together. For the next couple of minutes I watched in amazement as about 500 ducks swirled and circled above me. Quite a sight! As far as I could tell, 90% were Fulvous Whistling Ducks and only 10% Black-bellied.
Fulvous Whistling Ducks
Black-bellied Whistling Ducks
It is easy to tell the two species apart in flight. The Fulvous have all-black wings but have white-edged tails. The Whistling have all-black tails but the tops of their wings have a large white stripe.