The Postal Administration of Azerbaijan has issued the stamp set of WWF series which consist of four single stamps feature the Ferruginous Duck or Aythya nyroca on May 05, 2000.
Along with this issuance the local WWF cover as the First Day Cover also issued. The cover has image of this species on the left-side and special post mark depicted Aythya nyroca.
The Ferruginous Duck , also Ferruginous Pochard (Aythya nyroca) is a medium-sized diving duck from Eurasia. The species is known colloquially by birders as "Fudge Duck". It is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.
Their breeding habitat is marshes and lakes with a meter or more water depth. These ducks breed in southern and eastern Europe and southern and western Asia. They are somewhat migratory, and winter farther south and into north Africa.
