The World Wildlife Fund
On April 29, 1961, the World Wildlife Fund (WWF) was founded. The world’s largest conservation organization, the WWF supports around 3,000 projects in 100 countries.
Animals
ASPCA
On April 10, 1866, Henry Bergh founded the American Society for the Prevention of Cruelty to Animals (ASPCA). The first animal welfare organization in North America, it remains committed to sheltering abandoned animals and offering adoption programs, among other services.
USPS Introduces Nature of America Series
On April 6, 1999, the USPS issued the first stamp sheet in its 12-year Nature of America series. This popular series featured the first US self-adhesive sheets designed as one large scene.
Spay or Neuter Stamps
On September 20, 2002, the USPS issued the Spay or Neuter stamps in Denver, Colorado. The stamps had been the result of an extensive decade-long letter writing campaign.
Birth of Alexander Calder
Sculptor Alexander Calder was born on July 22, 1898, in Lawnton, Pennsylvania. He was best known for his moving art “mobiles” stationary sculpture “stabiles” as well as monumental-sized public works.
Trans-Mississippi Stamps Issued
On June 17, 1898, the prized Trans-Mississippi stamps were issued as part of the Trans-Mississippi Exposition in Omaha, Nebraska.
North American Wildlife Sheet
On June 13, 1987, the North American Wildlife sheet became the third US 50-stamp se-tenant. It was also the third stamp issue with a First Day ceremony outside of the US, in Canada.
Owney the Postal Dog
On June 11, 1897, the US Railway Mail Service mascot, Owney the Postal Dog, died in Toledo, Ohio. He rode the rails with the mail for nearly 10 years and even took steamships to Europe and Asia, earning international fame!
Flora and Fauna Series
On June 1, 1990, the USPS issued the first stamp in the Flora and Fauna Series, which was born from plans for a Priority Mail stamp in 1987.