Redhead
Aythya americana
The redhead is a pochard, a diving duck specially adapted to foraging underwater. Their legs are placed further back on the body, which makes walking on land difficult. The webbing on their feet is larger than dabbling ducks and their bills are broader to facilitate underwater foraging. In addition, pochards have a lobed hind toe. No pochard has a metallic colored speculum, something that is characteristic of other ducks. Voice: There is little information on redhead vocalizations outside of breeding calls. When the neck is fully extended in the neck-stretching display, males emit a cat-like wheee-oww. Males may also produce a soft coughing call, although this call is less frequent. Females emit a soft errrr note when inciting a male.
ID text from Wikipedia, CC BY-SA 4.0
Tufted Duck
Aythya fuligula
The adult male is all black except for white flanks and a blue-grey bill with golden yellow eyes, along with a thin crest on the back of the head. It has a prominent tuft on its head, which gives the species its name. The adult female is brown with lighter flanks, and is more easily confused with other diving ducks. In particular, some have white around the base of the bill, resembling the scaup species, although the white is never as extensive as that of those ducks. The female's call is a harsh, growling "karr", usually given in flight.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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