R.S. Brown 1768 Audubon's Shearwater Mexican Island 24 Oct. One adult bird bailed up a gullty 3 or 3" Scoterides. An adult & or fr. egg was atts'ts Last tonight. Bird was pure melanis- lic - had a few flecks of small white feathers around the head region, otherwise was all black. The mate was normal colored. Nest was under a pile of Porcelania weeds (dead) just west of the main wall complx on W. side. This is the first I have ever seen personally on this island. This species is spreading numerous in practically all sections of the island at night. During the They they are rarely in evidence, but before coming in from the ocean at near dusk. Apparently the Audubon population is flight oriented & not and I would imagine the vast bulk of the resident population sleeps each night on the island - shelters or at the member, as feeding. I inadvertently stumbled several hundred of this species during the stay, but never got a single band return. I believe the bulk of the bands have been worn off. They are fierce little diggers. Since I had 410 moved #3 bands, I decided not To waste time putting more aluminum bands on. Thus in effect I did little at all with this species. To the best of my recollection, I saw throughout the stay about as many young young of various sizes as I saw eggs. The total & each, I would imagine R.S. Brown 1768 Audubon's Shearwater Archean Island Oct about 10 # each. Where I mainly found while sleeping for WTS or Salvador's Petrels. From fairly good precollection, however, for every egg or chick noted, about 10 nest cavities were found empty with birds in- them. There is certainly for first nesting in mid July. I would imagine that a loss or kill in the nesting is occurring at this time. Birds however as everywhere. In all types of cover and over the whole island except washed layers- I had neither the opportunity nor the device to meet with any female, Friday Testing with this species without very fouls and so made no actual density counts. I believe the July figures were considerably high (2-500) and think that there can be no less than 8000 of this species present, probably consid- ertably more. Taking into consider- atting the number of fledglings present on both living quays should - although there, the failed females in our series, I ollback Do not believe they can be any less than 500 Audubon's considering their widespread presence in all types of habitat.