From left to right :
Scarlet Macaw (緋紅金剛鸚鵡) ; Double Yellow-headed Amazon (雙黃頭亞馬遜鸚鵡)
Green Kingfisher (綠魚狗) ; Ruby-throated Hummingbird (紅喉北蜂鳥)
Resplendent Quetzal (鳳尾綠咬鵑)
Nicaragua (2000)
10th August, 2009. León
Scarlet Macaw (緋紅金剛鸚鵡) ; Double Yellow-headed Amazon (雙黃頭亞馬遜鸚鵡)
Green Kingfisher (綠魚狗) ; Ruby-throated Hummingbird (紅喉北蜂鳥)
Resplendent Quetzal (鳳尾綠咬鵑)
Nicaragua (2000)
10th August, 2009. León
Some of Latin American countries always issue many stamps are colourfully and attractive, however they are not popular and welcome in philatelic market, many collector's thought they are commercial issues and mostly not for postal use. It is so pity that some of species only appear on these stamps and no other replacement. Above Nicaragua sheet which divided into two seems one of them, but now it stamped full of postmarks and found it in my mailbox last month, thanks Jean-Michel his covers.
In past, both five birds are quite common in Latin America to Amazon area, unfortunately as many reasons like they became popular pet in the world, folk teals in locals or illegal hunting and trading, some of population were decreasing. Now Double Yellow-headed Amazon listed endangered species and Resplendent Quetzal nears danger.