Thank you Park for this cover from South Korea. Five bird stamps are used. From left to right:
Japanese White-eye (Zosterops japonicus): The stamp was issued in 1997. It is native in East Asia but it can be found in other countries as a pet. It was also introduced to Hawaii. It feeds on insects and nectar.
Great Tit (Parus major): The stamp was released in 2006. It can be found in woodlands in the Middle East, Europe, parts of North Africa and Northern and Central Asia. It has 14 subspecies. It eats berries, seeds, spiders, insects and caterpillars.
Yellow-billed or Chinese Grosbeak (Eophona migratoria): The stamp was issued in 2002. This species of finch lives in temperate forests in Russia and Asia. It has two subspecies.
Little Tern (Sterna albifrons): The stamp was released in 1994. This seabird can be found in the tropical and temperate coasts and inland waterways of Asia and Europe. In the winter it migrates to the tropical and subtropical oceans so then it can be found even in Australia and South Africa. There are three subspecies. It feeds on fish.
Scops Owl (Otus scops): The stamp was released in 1993. I have presented this species in the past.

Thank you James for this card sent from South Korea.
Black-crowned Night Heron (Nycticorax nycticorax): The stamp was released in 2000. This medium-sized heron can be found almost anywhere expect Australasia and the coldest parts of the planet. It eats small fish, crustaceans, small birds, small mammals, frogs and aquatic insects.
Tundra Swan (Cygnus columbianus): It is the smallest of the holarctic swans and it has two subspecies. It can be found in Arctic and subarctic tundra but it migrates in marshlands and grasslands near the coast. It feeds mostly on aquatic vegetation.