5 Dollars - Elizabeth II 4th Portrait, Hamilton's Frog, Silver Proof

Hamilton's frog (*Leiopelma hamiltoni*) survives on a single rocky outcrop — Stephens Island in the Marlborough Sounds — where the entire wild population numbers in the low hundreds. New Zealand's conservation coinage program has consistently highlighted species whose ranges have contracted to near-absurd specificity, and this issue fits that pattern precisely. The frog itself is a Jurassic-lineage relict; its ancestors preceded the extinction of the dinosaurs.