National Geographic : 1911 Dec
A ROOKERY ON ST. GEORGE ISLAND Most of the cliffs on St. George Island are so close to the beach that little rookery space exists, and the number ofseals resorting to that island was never so large as on St. Paul. This type of rookery ground, formed by disintegrating cliffs, supplemented by boulders pushed up bythe drift ice each winter, is very favorable for both young and old seals. The white lines on the rocks were placed there tofacilitate the government officers in the seemingly hopeless task of taking the annual census of the seals. Photo from Hugh M. Smith, U. S.Bureau ofFisheries.