Estonia
Date of Issue: 9th of May 2024
two stamps (2x 2.60 €)
1.1 Zander (Sander lucioperca) - IUCN Red list - Wikipedia article
1.2 Curly-leaf pondweed (Potamogeton crispus) - IUCN Red list - Wikipedia article
2.1 European flounder (Platichthys flesus) - IUCN Red list - Wikipedia article
2.2 Bladderwrack (Fucus vesiculosus) - Wikipedia article