In order to promote environmental protection of the natural ecology and to preserve the habitat of wildlife, this Directorate released a set of 〝Taiwan Endangered Mammals Postage Stamps〞. The four stamps, arranged in a se-tenant block, each has value of 5.00. The designs of the four stamps are： Chinese river otter(Lutra lutra chinensis), Formosan flying fox (Pteropus dasymallus formosus), Formosan clouded leopard (Neofelis nebulosa brachyurus) and Formosan black bear (Selenarctos thibetanus formosanus).