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, ana generally south of the high Hawaiian Islands. This 
distribution pattern is similar to April 19 64'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 
Lca^xi 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 
tame in 13 cruises that these two species have been observed flocking to¬ 
gether 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 
wiuh 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 
Tne 19 oirds seen this month were distributed again in a relatively 
random manner. Tne slignt increase in numbers from 15 in March is probably 
of no significance. 
