23 as Kure's famous monkey. I noted that two of my Booby study nests have been abandoned ( Hadx not checked them in 7 days ). The Frigates have an interesting activity pattern. During much of the day there are inactive, but about 1500 - 1600 many are in the air awaiting the arrival ( apparently) of fish-laden booby's and tropicbirds. The seem to be most successful in robbing Masked and immature Red-foots: Adult Red-foots I have yet to see pillaged for their food. Right now our work is a bit up in the air until we find out what is happening with this new work crew, and what we can do in reguard to lab space. We still need to get 50 rats for this month for Bills work, and I hope to mark every wedgetail burrow in the two shearwater-petrel study plots and to band in each plot once more. 10-22-63 Up very early to work in the rat study area, and there until almost 2 in the afternoon weighing each rat caught. The catch continues to be high ( about 120 animals )and Bill con- tinues to be quietly excited over the findings he makes each day in spite of the difficulties involved in handling the volume animals with which he is working. I have been examining the skeletons of all birds found in the antenna fields, and those which are intact with both wings usually have a break somewhere in one of the wings, indicating collisions with guy wires. I believe that from two to four birds each week on the average are killed this way: This estimate may be low. Thus far in our work we have found the following numbers of birds killed under the antenna. All had broken or sheared off wings. Masked Booby 3 I have also seen skeletons of Brown Booby 1 Frigates, both albatross, and Red-footed Booby 1 turnstones under the tower, and Wedgetailed Shear.l found several noddy skeletons on Bonin Id. Petrel 2 the beach which could have broken Golden Plover 2 their wings in collisions with R-t.Tropicbird 5 the otermost guys. Total 15 I believe that such collisions are a major cause of mortality in most of the species which frequent the island in large numbers, particularly those such as the booby's and petrels and shearwaters which nest directly under the circle of guy wires. The following observations on bird activity. Tropicbirds this morning were not seen flying until 0745 to 0800. Few birds were then aloft between 0800 and 0945. At 0945 I noted many adults apparently returning from feeding in the lagoon, and