5 Dollars - Elizabeth II Diamondback Terrapin

Cook Islands has issued wildlife-themed silver rounds under its name since the 1990s, functioning largely as bullion products with nominal face values bearing no relation to actual monetary circulation. The Diamondback Terrapin — native to the brackish coastal marshes of the eastern United States — has no particular connection to the Cook Islands, which is standard practice for this category of licensed coinage produced primarily for the collector bullion market.

The terrapin was once hunted nearly to local extinction along the Atlantic seaboard, prized for turtle soup through the 19th and early 20th centuries.