The United States Postal Service released this popular 15-stamp sheet on Oct. 2, 1996, to promote awareness of endangered wildlife. The following wildlife are featured: Black-Footed Ferret, Thick-Billed Parrot, Hawaiian Monk Seal, American Crocodile, Ocelot, Schaus Swallowtail Butterfly, Wyoming Toad, Brown Pelican, California Condor, Gila Trout, San Francisco Garter Snake, Woodland caribou, Florida Panther, Piping Plover, and Florida Manatee.

This attached pair of mint stamps from the United States features two of the world's rarest birds, the North American Whooping Crane, and the Chinese Black-Necked Crane. These attractive stamps were designed by Clarence Lee, based on illustrations by Zhan Gengxi. The first day of issue was Oct. 9, 1994.

Known as the "Creatures of the Sea Issue," this block of four mint stamps was issued by the United States on Oct. 3, 1990. This attractive postage stamp set paid tribute to four marine mammals; the Killer Whale, the Northern Sea Lion, the Sea Otter, and the Common Dolphin.

Muskellunge, Atlantic Cod, Largemouth Bass, Bluefin Tuna, and Catfish are featured on this booklet pane of five mint stamps. Issued by the United States Postal Service on March 21, 1986, this pane is popular among wildlife and fishing collectors, as well as stamp collectors.

This mint stamp was issued on July 2, 1984, to commemorate the 50th anniversary of the Migratory Bird Hunting and Conservation Stamp Act. The Stamp Act was enacted in 1934 in response to a proposal by conservationist Jay Norwood ("Ding") Darling that waterfowl hunters should be required to purchase a federal revenue stamp, with the acquired funds going towards the purchase or lease of waterfowl habitats. The stamp design features Mallard Ducks dropping in.

This small-sized stamp (19mm x 23mm; the above image is an enlargement) was issued in a booklet format on January 8, 1982. The featured Bighorned Sheep design is the same design depicted on one of the 1981 wildlife booklet stamps (see item# USW9), though the color has been changed to blue for this issue.

Issued on June 26, 1981, this attached block of four mint stamps promoted the preservation of American wetland, grassland, mountain, and woodland habitats of our native birds and mammals. The animals featured on the stamps are the Blue Heron, Badger, Grizzly Bear, and Ruffed Grouse.

Each of these three mint stamps was issued during 1956 to promote the protection of wildlife. This attractively engraved set includes a Pronghorn Antelope buck and two does, a King Salmon migrating to a spawning grown, and a Wild Turkey.

The United States Postal Service promoted its sponsorship of the 1992 U.S. Olympic team with this high face value "international express mail stamp" issue. The stamp was released on Aug. 31, 1991. The $14.00 face value of this stamp met the rate for express delivery of mail weighing up to eight ounces to any of 109 countries. The attractive design features the Olympic Rings and a Bald Eagle flying over a shoreline. The 1992 Summer Olympic Games were held in Barcelona, Spain.

Issued on June 6, 1991, the United States Postal Service promoted its sponsorship of the 1992 U.S. Olympic team with this "domestic express mail stamp." The high face value of this stamp met the rate for overnight 8-ounce delivery to anywhere in the U.S. The stamp design features a Bald Eagle and the Olympic Rings. The 1992 Summer Olympic Games were held in Barcelona, Spain.