1.5 Euro Javan rhinoceros

The Javan rhinoceros is functionally extinct on mainland Asia, with the last confirmed individual shot in Vietnam in 2010. The sole surviving population — fewer than 80 animals — clings to Ujung Kulon National Park on Java's western tip, making this among the rarest large mammals on earth. Spain's Real Casa de la Moneda has issued a series of wildlife-themed pieces under a 1.5 euro denomination that has no circulation role; the face value is essentially nominal, the coins sold directly to collectors at a premium far above metal content.