5 Dollars - Elizabeth II Brook Trout

Part of a broader micro-gold wildlife series, this Cook Islands issue is a licensing arrangement — Cook Islands has no independent central bank and delegates monetary authority to New Zealand, making its collector coinage essentially a revenue instrument produced under contract by private minting firms. At 0.5 grams of .9999 gold, the piece contains roughly half the gold of a standard 1/10 oz coin, a format that emerged in the 2010s as mints competed for entry-level bullion collectors priced out of larger pieces.

The brook trout itself is native to eastern North America, carrying no particular connection to the Cook Islands.