The Silver Teal from South America has a grey/silver underback and yellow on the base of its blue bill.
Its cap and beak stripe are very dark brown. Its cheek is creamy rather than white.
-- The
Puna Teal, also from South America, is like the Silver Teal but has an all blue bill.
Its cap and beak stripe are black. Its cheek is white.
-- The
Hottentot Teal, from Africa, is similar but with brown cheek marks,
an all bright blue bill (with black stripe) and beige underside back.
Showing teal-green speculum - sometimes the cheek looks white like the Puna Teal but the body side stripes on the Silver are wider.