What is Periwinkle?
'''Periwinkle''' may refer to: ;Animals: * Periwinkle, a common name for a number of gastropod molluscs in the family [[Littorinidae]] ** [[Common periwinkle]] (''Littorina littorea'') ** [[Blue periwinkle]] (''Nodilittorina unifasciata'') ** [[Rough periwinkle]] (''Littorina saxatilis'') * Periwinkle, a regional name for the [[Trichoptera|caddisfly]] larva ;Plants: The common name of plants in two genera in the family [[Apocynaceae]]: * ''[[Catharanthus]]'' or Madagascar periwinkles * ''[[Vinca]]'' or European periwinkles ;Other uses: * [[Periwinkle (color)]], a pale shade of blue * Periwinkle, a character in ''[[Blue's Clues]]'' * Periwinkle, a character in ''[[The Bellflower Bunnies]]'' * Periwinkle, a character in ''[[Secret of the Wings|Tinker Bell and the Secret of the Wings]]'' * Periwinkle, the main character in [[Patricia A. McKillip]]'s book, ''The Changeling Sea'' {{disambig}} What is the point of learning