Rock of Gibraltar may have originated from an escape of North African animals transported to Spain; it is also possible that the original Gibraltar macaques are a remnant of populations that are known to have spread throughout Southern Europe during the Pliocene, up to 5.5 million years ago. Some animals of the Rock have been reintroduced by the Alameda Wildlife Conservation Park who have three Barbary macaques. The Rock of Gibraltar, at the head of the Strait, is a prominent headland, which accumulates migrating birds during the passage periods. The vegetation on the Rock, unique in southern Iberia, provides a temporary home for
Gibraltar rock (candy) old Salem dame" as saying "I know I must be growing old, because a peppermint Gibraltar is so comforting to me." Gibraltar candies are mentioned in Hawthorne's novel "The House of the Seven Gables", published in 1851. In the book, a character named Hepzibah Pyncheon operates a little "cent-shop" which contained "a glass pickle-jar, filled with fragments of Gibraltar rock; not, indeed, splinters of the veritable stone foundation of the famous fortress, but bits of delectable candy, neatly done up in white paper." His story "The Old Apple-Dealer", collected in "Mosses from an Old Manse", similarly mentions "that delectable condiment,