Federal Migratory Bird Hunting and Conservation Stamps, commonly known as "Ducks Stamps, " are pictorial stamps produced by the U.S. Postal Service for the U.S. Fish and Wildlife Service. They are not valid for postage

Volcanoes on stamps with regional valcanoe maps

A webpage on Mushrooms on Stamps

Stamps of Israeli Birds listed by Family, Latin and English names

Information and illustrations of all Australian postage stamps depicting Australian flora. Site by the Australian National Botanical Gardens

Stamps and Coins on Meteorites, Comets and Craters

Dedicated to Sea Turtle Postage Stamps of the World indexed country and species wise.

National Birds of the world on stamps

Diamonds on postage stamps (Antwerp Diamond Museum)

Rock and Fossil Stamps of the United States