There are several YELLOW-BILLED duck species.
The SPECKLED TEAL, above, also called the Yellow-billed Teal and the taxonomic name Anas flavirostris inhabits much of South America (including South Georgia).
It has 4 subspecies in different areas, including the CHILEAN TEAL (the nominate species Anas flavirostris flavirostris) from Brazil through to the Falklands (and South Georgia), and the SHARP-WINGED TEAL (Anas flavirostris oxyptera) featured here, which lives in Peru, Chile and Argentina.
The YELLOW-BILLED PINTAIL, Anas georgica, with nominate subspecies SOUTH GEORGIA PINTAIL, is also mistakenly sometimes referred to as the Yellow-billed Teal. It is larger than the Speckled Teal and also comes from South America, including the islands of South Georgia from which it is named.
The YELLOW-BILLED DUCK, Anas undulata, is a mallard-sized duck from south and east Africa. (The Mallard drake also has a yellow bill.)
The SPOT-BILLED DUCK or SPOTBILL, Anas poecilorhyncha, with its subspecies Indian (nominate), Chinese and Burmese, is native to Asia.