What are the size and age characteristics of Purple Martins?
Adult Purple Martins (Progne subis subis) weigh an average of 1.9 ounces (55 grams); their average length is 7 inches (19.5 centimeters); and their average wingspan is about 11 inches (26.8 centimeters). Average age for martins is 2-5 years, with some living 6-7 years; the oldest martin on record lived to be 13 years and 10 months.