The term crab is often applied to several different groups of short decapod crustaceans with thick exoskeletons, but only members of the Brachyura are true crabs. Other taxa, such as hermit crabs, porcelain crabs and king crabs are, despite superficial similarities, not crabs at all; rather, they belong to the Anomura and can be distinguished from true crabs by counting the legs. In Anomura, the last pair of walking legs is hidden inside the carapace, so only four pairs are visible (counting the claws), whereas uninjured true crabs always have five visible pairs. This series of "Marine Life Protection" proof one dollar coins has been a hit with collectors since the first coin was issued in 1992. It is hard to say whether the obverse or reverse is the most attractive, but they are becoming exceedingly hard to find. Palau was chosen as the location for the 10th season of the hit reality series Survivor, and this coin depicts regional marine life, as well as a beautiful mermaid. This One Dollar coin is legal tender and has been issued by authority of the government of Palau.