A partridge is a wild brown bird. What is that partridge doing in a pear tree in the song "The Twelve Days of Christmas"? Who knows, since most partridges live on the ground and hardly ever climb trees.
Partridges are popular with European hunters, but there are very few partridges in North America, although some have been introduced as game birds. The word partridge comes from the Greek perdix and can ultimately be traced back to a Sanskrit word that mimics the whirring sound of a bird's wings.