DeBenedictis 1964 Feb 18 Punta Suarez, Isla Espanola (Hood), Galapagos. rough "walk walk" call, explores and sun sheltering. They erect the bend and neck feathers when one approaches the nest, and make (intention biting) downward movements of the bend, bill pt. open. first to the one side, then forward, then to do other side and back again. The movement is very smooth. Noted two interesting forms of thermo-regulation - At midday they gular fan considerably. They brood the eggs & small young by placed the feet under the eggs, and the breast loosely above the egg to shield it with the body [drawing]. large young (500g) can thermoregulate by themselves, according to Dr. Bartholomew. The brooding adult also erects the scapulares and back feathers so that air can move under this region. Watched a Blue- footed Booby skim low along the surface of the water then angle sharply in and go under, for a second or so, come up, and float on the surface. They float very light, head + tail up. tails down. Their reaction to approach to the nest is quite un like that of S. dacylactis. They point the bill at the intruder, call, and shake the head rapidly (8-12 times/sec.) up and down. Show the same head + neck feather erection of dacylactis. I [illegible] there are now c. 350 pairs of dacylactis and 450-550 pairs of nebrivini on the Pt. Niss, the Blue-foot pop. being somewhat depleted by the