5 Pesos Nutria de Rio

Part of Mexico's long-running wildlife conservation series, this issue belongs to a program that began in 1994 and ran through the early 2000s, pairing fine silver bullion specifications with endemic species under varying degrees of ecological pressure. The river otter — Lontra longicaudis — had seen significant population decline across Mexican river systems due to habitat loss and unregulated trapping through the mid-twentieth century.

Mintage figures for individual issues in this series varied considerably year to year, and the 2000 dated pieces were among the final strikes before the program restructured.