1966 Bill Arvey Journal June 23. A very large dense flock of Cormorants is out, the water is actually disturbed so much by their activity that one can notice their presence without glasses just by the turbid condition of the water there. Cormorants far outnumber gulls in this flock. Gull activity seems very slight around the flock. 8:55 It seems that a substantial part of the flock split off and started fishing in another direction. They flew off about 50 feet then put down again. 9:00 AM After watching the flock for awhile it seems to be true that there is a definite entrance and exit to the flock. Entering birds always seem to go to the east end of the flock. The birds leaving do so from the west end, or part closest to the island. The flock seems to have drifted some 100 +/- yards to the SE since first observed and are now some 2005 yards V of Arch Rock. 9:15- Now many birds from the Tower Pt colony are traveling out to this flock. Have seen some groups of about 10 birds moving out thru the gap between Arch Rock and Sugarloaf and then on out to the flock. Many cormorants are in Fisherman Bay The floc is definitely moving East x South. It is now 150 yds off Arch Rock, the head of our flock is between Arch and Sugar Loaf.