Ludwig, JP 1964 26 (In my opinion they are a more adequate size than No 5 size), and exhausted our field supply of 189 5's and 100 4's on the population. Today we could have banded at least 500 if we had brought the bands. The fact that no recoveries were made on birds banded last fall suggests strongly that the birds banded today will finish breeding by September. Sooty Tern Banding was very difficult - all birds were netted from the air and consequently the low number of 211. This population is separated into a number of well defined pockets and the nesting within these pockets is much less dense than at Johnston. My population estimates for this species and the others are accurate; I believe, to 25 percent or better. The criterion of 50 percent outlined in the Circular Letter No. 4 are inappropriate here. These estimates are not guesses but are based on careful estimates of the individual pockets of breeding. Not all of the birds are breeding yet and I expect 50-60 M pairs to be present by April 20. Only one other species was noted on Manana by me - a Sanderling on the rocky shore. 3 Rabbits were seen - 1 was killed. Behavioral Notes: Sooty Terns - Today I distinguished 4 voices used by this species, 1) the familiar "clatter" call, 2) A moaning given when being handled, 3) a rattle given when their nest was approached, and a soft grunting sound given when 2 birds were fighting. Common Noddies: Courtship Flight(?) - Begins low over either land or water. Phase 1 -