After having previously issued the first three sets in the “Birds of Taiwan” definitive stamp series (on November 3, 2007 and January 30 and June 5, 2008), this Post is now following up with a fourth set of four stamps, featuring Rostratula benghalensis, Turdus poliocephalus, Amaurornis phoenicurus and Cettia acanthizoides. The designs of the stamps follow:   1.    Rostratula benghalensis (NT$0.50): This common resident bird is about 25 centimeters in length. The females have a white eye-patch, an obvious yellow stripe extending from the bill to the center of the crown, and a wide white band running up the side of the breast and onto the mantle. The males have a yellow eye-patch. These are the bird’s important identifying characteristics. 2. Turdus poliocephalus (NT$9.00): About 22 centimeters in length, it is an uncommon resident bird and an endemic subspecies of Taiwan. The males have a reddish brown belly, an obvious white head, brown eyes, a brown beak, and yellow legs. They often sing while hiding in the dense canopy of trees. 3. Amaurornis phoenicurus (NT$13:00): About 29 centimeters in length, it is a common resident bird of Taiwan. Its crown, back, uppertail coverts, and wings are dark brown. Its face, breast and upper belly are white. Its tail is very short with chestnut red undertail coverts. Its bill is yellow and the base of its upper beak is red. It has yellow feet and very long toes. 4. Cettia acanthizoides (NT$17.00): A common resident bird and an endemic subspecies of Taiwan, this tiny warbler is about 10 centimeters in length. It has plain plumage, and males and females share similar coloration. The bird is very secretive and not easy to spot. It inhabits mid- to high-altitude mountain areas. It is quick and nimble but seldom flies.