Bulwer's Petrel The spring migration of this species into the BCF area has begun. Most of the 96 individuals seen this month were found in the western half of the area, and generally south of the high Hawaiian Islands. This distribution pattern is similar to April 1964's but the numbers seen this month indicate that the migration is further underway than it was at the same time last year. Of interest was the observation of two flocks of Bulwer's Petrels and Leach's Petrels, one on 17 April of 20 Leach's and three Bulwer's and again on 22 April of five Leach's and two Bulwer's. The birds were not actually seen feeding but both flocks were fairly tightly packed. This was the first time in 13 cruises that these two species have been observed flocking to- gather in this manner. Leach's Petrel An all time high of 297 birds was recorded this month. Numbers were distributed over the entire area, evidently in a random manner. Many were flying rather directionally to the north. This peak in numbers corresponds with a similar peak recorded in April 1964 as the birds migrate north for the beginning of their breeding season. For notes on two flocks involving numbers of this species see the preceeding Bulwer's Petrel remarks. Two were collected. Red-tailed Tropicbird The 19 birds seen this month were distributed again in a relatively random manner. The slight increase in numbers from 13 in March is probably of no significance.