Pochards and allies

Marbled Duck and White-winged Duck have both previously been treated as belonging to different subfamilies but are apparently now thought to be more closely affiliated with the pochards.

Marbled Duck Marmaronetta angustirostris

White-winged Duck Asarcornis scutulata

Red-crested Pochard Netta rufina

Southern Pochard Netta erythrophthalma

Rosy-billed Pochard Netta peposaca

Ferruginous Duck Aythya nyroca

Baer's Pochard Aythya baeri

Hybrid: Feruginous Duck Aythya nyroca x Baer's Pochard Aythya baeri

Common Pochard Aythya ferina

Hybrid: Rosy-billed Pochard Netta peposaca x Common Pochard Aythya ferina

Hybrid: Ferruginous Duck Aythya nyroca x Common Pochard Aythya ferina

Canvasback Aythya valisineria

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This as far as I've got systematically - more to follow soon.

Hybrid: Red-crested Pochard Netta rufina x Tufted Duck Aythya fuligula