0 Euro - Zoo Aquarium Madrid; gorilla

EuroSouvenir notes occupy a peculiar legal niche: they are issued under a European collector framework that permits zero-denomination pieces to carry the euro visual identity without constituting legal tender. Oberthur Fiduciaire, one of the few security printers with the accreditation to produce euro-format material outside the ECB's own currency runs, handles the bulk of this series. The Madrid Zoo Aquarium issued this particular piece as a visitor souvenir in 2019, one of dozens of institution-specific variants that differ only in the central vignette and issuing venue text.

The hologram strip meets the collector program's minimum security specifications — enough to discourage crude copying, not enough to matter monetarily.