Phenology

Below is a checklist of phenological postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.). Catalog numbers, years of issue, and notes on the items featured are given when available. If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page.

Phenology: The scientific study of cyclical biological events, such as flowering, breeding, and migration, in relation to climatic conditions. Phenological records of the dates on which seasonal phenomena occur provide important information on how climate change affects ecosystems over time.

^*Scott catalog number, unless prefixed with Mi or BL for Michel.
^**FDC = first day cover; SS# = Souvenir Sheet, MS# = Miniature Sheet, where # = number of stamps in the strip or sheet; and the numbers in parentheses are the catalog numbers of the stamps in the sheet.

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