I think these Northern Pintails were the most handsome birds at Agua Caliente Park last week.
These males were in their breeding plumage. "Male makes wheezy mewing notes and a whistle. Female quacks." They winter from central United States southward to northern South America. Also in southern Europe, northern Africa, and southern Asia. They are not endangered, but populations are lower than desired. [All About Birds (Cornell Ornithology Lab)]
"This elegant duck with its trim form and swift flight has been dubbed 'the greyhound of the air'. ... They are omnivorous. ... Main foods eaten include grain, moist-soil and aquatic plant seeds, aquatic insects, crustaceans and snails." [Delta Waterfowl]