Cairina is a genus of ducks in the bird family Anatidae. It has two species, which are similar anatomically but quite distinct in external morphology. ==Taxonomy== Their genus was named for the word for native of Cairo as they were believed to have originated in Egypt. These were initially placed as type genus in the `Cairininae` (or `Cairinini...... Found on http://en.wikipedia.org/wiki/Cairina