6.Dec. Green Island, Kure Atoll, Leeward Islands Spent the day surveying, measuring and tabulating the plants on the plant succession study areas. Completed three plots and a fifth of the fourth. In the evening Ken and I recaptured the Masked Boobies on the antennae field. There were several reasons for this: 1. It would allow us to make the most accurate population estimates. 2. It would tell us if new birds were entering the population. 3. It would give us an estimate of population structure. (in terms of sex and age structure) 4. It would allow us to tell whether the pairs recorded at time of banding were still functioning as pairs. 5. It would allow us to mark birds by sexes to further facilitate further studies. Males were marked with a cross bar; females with a dot on the head. Birds unidentifiable or unidentified as to sex were given a longitudinal streak on the forehead. A single bristle-thighed curlew was seen on the north beach; I hand caught a near starving golden plover which we banded and released and Bonin Petrels appear fairly common in airfield area.