Pink-backed pelicans have mostly grey plumage with a pinkish back and underparts. The pink colour comes from a gland and is spread while preening. Pink-backed pelicans are one of the smallest pelican species. They are approximately 49 – 51 inches in length, with a bill length of 11 – 15 inches and a wingspan of 7 – 9.5 feet. They weigh between 9 – 15.5 pounds, with females being slightly smaller than males. Pink-backed pelicans may live between 15 – 25 years in the wild and up to 54 years under human care.