5 Dollars Red Lionfish

Palau has issued wildlife-themed silver pieces since the 1990s, but the Red Lionfish entry in that program coincided with growing scientific alarm over Pterois volitans as an invasive species devastating reef ecosystems across the Caribbean — an irony not lost on marine biologists, given Palau's own reefs remain among the healthiest on the planet precisely because lionfish are native there and held in ecological check by local predators.