Debenedictis 1964 Creagurs Feb 17 Punta Suarez, Isla Espanola, Galapagos. spent about an hour watch about 15 pairs of guels on the cliff in the inlet just east of the blow holes. The birds were fairly active until by the time I quit activity had decreased somewhat noticeably. Without a watch, I guess I was out from 9:30 to c. 11 A.H. Most of the behavior I saw was one or the other member of a pair claiming stay (I think) birds off a territory, which was small - 6 ft dia to a ledge on the cliff barely large enough for the pair. Saw almost no evidence of any forward but a more or less direct attack was frequent, although I saw no cases of more than momentary physical contact between any two birds. One guil landed on a flat ledge - 10-15' wide, near another. The latter extended the neck towards the former, opened the bill and walked towards the newcomer, opening the wing 7/8's of the way as it came close. The newcomer flew off as the resident bird approached. A guil landed near a 2nd bird, 2 ft away. The 2nd guil pointed the bill at the first bird, which flew off. The 1st bird then returned to the former position. A guil landed on a cliff, a 2nd guil already there, wings up, wing 1/4 open, bill open, chased the 1st about a ft., then a 3rd guil in the same posture came out and chased the 1st 2 guils away, it being in its same posture as did the 2nd guil.