United Nations--Vienna

Scott No.: 311
Date of Issue: April 4, 2002
Species: Sonoran Green Toad (Bufo retiformis)

*Scott No.: 376, 379
Date of Issue: March 16, 2006
Species: Poison Dart Frog (Dendrobates pumillo), Yellow-banded Poison Dart Frog (Dendrobates leucomelas)

See also: First Day Cover

*Scott No.: 617
Date of Issue: March 2, 2018
Set: Endangered Species
Species: Malagasy Painted Mantella (Mantella madagascariensis)