Kaskaskia River – The American White Pelicans have returned to the Kaskaskia River Project on their way north to their spring nesting areas. Pelecanus erythrorhynchos, is one of the largest birds in North America. These large and plump birds have an overall length between 50–70 inches, a wingspan of 9-10 feet, and average weight between 11 and 20 lbs. This primarily white bird has black-tipped wings, and a yellow bill that measures up to 15 inches in length.