United States -- Ornate Chorus Frog (2003)

In 2003, the United States issued a series of 37-cent, self-adhesive stamps featuring endangered reptiles and amphibians.  Designed by Steve Buchanan, the stamps feature the blue-spotted salamander, the ornate chorus frog, the reticulate collared lizard, the ornate box turtle and the scarlet kingsnake. The stamps were part of the National Stamp Collecting Month:each year in October, “the USPS issues a commemorative stamp – or stamps – that appeal to young people. This year the Reptiles and Amphibians stamps help highlight this educational and family-oriented activity.”  First-day ceremonies were held at the San Diego Zoo.

For some reason, first day covers for this series abound.