Issued by Mongolia on December 10, 1989, this complete mint set of four stamps features beavers (Castor fiber birulai) cutting down sapplings, rolling wood across the ground, on land and in the water, and with their young. $2.20 retail value (Scott 2007 Standard Postage Stamp Catalogue, Vol. 4).

This complete mint set of four stamps features different views of the crane Grus vipio pallas. Issued by Mongolia on May 23, 1990. The retail value of this set is $2.40 (Scott 2007 Standard Postage Stamp Catalogue, Vol. 4).

Issued by Mongolia on June 20, 1990, this complete mint set of seven stamps features a variety of marine mammals. The scientific names of the mammals are inscribed on the stamps. $4.25 retail value (Scott 2007 Standard Postage Stamp Catalogue, Vol. 4).

Featuring insects (beetles), this mint set of seven stamps was issued by Mongolia on May 22, 1991. The scientific names of the beetles are inscribed on the stamps. Please note that the lowest value stamp (lowest denomination) has had the gum removed from the back and has light paper wrinkles; we have therefore discounted our list price by over 35%. $4.25 retail value (Scott 2007 Standard Postage Stamp Catalogue, Vol. 4).

This complete mint set of five stamps, including a high denomination stamp in a souvenir sheet format, depicts wolves nursing young, snarling, eating a deer, etc. The scientific names of the wolves are inscribed on the stamps. Issued by Mongolia on January 17, 2000. The retail value of this set is $6.75 (Scott 2007 Standard Postage Stamp Catalogue, Vol. 4).

This complete mint set of eight stamps, including one in a mini-sheet (souvenir sheet) format, was issued by Mongolia on October 29, 1991. Eight different lizards are depicted; their scientific names are inscribed on the stamps. The retail value of this set is $9.50 (Scott 2007 Standard Postage Stamp Catalogue, Vol. 4).

This complete mint set of two large stamps, issued by Mexico on July 3, 1982, features sea turtles and Gray whales, along with a map of Mexico showing the common territories of these marine animals. $3.00 retail value (Scott 2007 Standard Postage Stamp Catalogue, Vol. 4).

Canada Post issued this attractive mint sheet of 20 stamps, featuring birds of Canada, on March 13, 1998. The sheet includes five copies each of four different stamp designs. The stamps feature the following birds: Hairy Woodpecker, Great Creasted Flycatcher, Eastern Screech Owl and Gray-Crowned Rosy-Finch. Scott Cat.# 1710-1713.

Issued by Canada Post on March 13, 1998, this mint strip of four stamps feature the following birds of Canada: Hairy Woodpecker, Great Creasted Flycatcher, Eastern Screech Owl and Gray-Crowned Rosy-Finch. Scott Cat.# 1710-1713 (1713a).

The Republic of China issued this mint set of two stamps on January 20, 2009, to celebrate Giant Pandas from the Taipei Zoo. Featured are Tuan Tuan (on log bridge) and Yuan Yuan (eating). Scott Cat.# 3849-3850.

Issued by the Republic of China (Taiwan) on January 20, 2009, this mint mini-sheet (includes one large stamp) features the Giant Pandas Tuan Tuan and Yuan Yuan from the Taipei Zoo. Scott Cat.# 3851.

Featuring an Amur Tiger cub, this mint self-adhesive stamp was issued by the U.S. Postal Service on September 20, 2011, to promote the conservation of vanishing species. This stamp is classified as a semi-postal stamp; in addition to paying the first class letter rate, an additional 11-cent surtax was added to the price of the stamp. This surtax was for the Multinational Species Conservation Funds of the U.S. Fish and Wildlife Service. Scott Cat.# B4.