The blue iguana, or Cyclura lewisi, is a large reptile native to the island of Grand Cayman in the Caribbean. It is one of the most endangered species of iguanas in the world, with only an estimated 1,000 individuals remaining in the wild.

The blue iguana can reach lengths of up to 5 feet (1.5 meters) and can weigh up to 30 pounds (14 kilograms). Their coloration ranges from gray to dark blue, with some individuals having black or white markings.

Blue iguanas are herbivores and feed mainly on fruits, flowers, and leaves. They are also known to eat insects and small vertebrates on occasion. They are a diurnal species, meaning they are active during the day and rest at night.

The main threats to the blue iguana are habitat destruction, introduced predators, and hunting. The Grand Cayman Blue Iguana Recovery Program was established in 1990 to help save the species from extinction. The program has been successful in breeding and reintroducing captive-bred iguanas into the wild.

The blue iguana is an important cultural symbol for the people of the Cayman Islands and is featured on the country's coat of arms. It is also a popular tourist attraction, with visitors able to see the iguanas up close and even participate in feeding programs.

The blue iguana's unique appearance and status as an endangered species make it an ideal subject for a postage stamp. A stamp featuring the blue iguana could not only help raise awareness for this species, but also showcase the natural beauty and biodiversity of the Cayman Islands.