Behle 1934. South Farallon Island, Pacific Ocean April 13 weeks old. These had their primary feathers started in growth and were able to scramble over the rocks away from intruders. The gular pouches were white as contrasted to the orange yellow of the adults. Adults guarding the young could be approached to within 6 or 8 feet before they would fly and generally seemed unconcerned over our presence. When we got real close they would croak and grunt like frogs and wave their heads back and forth in a threatening manner. The older young were belligerent. Remains of gob-sized fish were deposited around the nests and the usual filth prevailed with countless flies. The nests were very different in construction from those of great salt lake birds in having no mud and not being built up over a few inches. They were made of small pieces of drift wood the size of your finger, coarse weed stems and stray feathers chiefly gull primaries and tail feathers. Many of the adults standing near the nests had their plumage ruffled out fearfully