Termination of the Nesting Cycles for Major Species Breeding on Howland Island 
Species ___ _ 1963 1964 1965 - 1966 
Red-tailed Tropicbird ca late Jan. 1964 ca» early May 1965 ca early Oct .1965 pr.ca. late Dec or 
early Jan. 1966 . 
Blue-faced Booby 
Brown Booby 
Red-footed Booby 
Great Frigatebird 
Lesser Frigatebird 
Sooty Tern 
Spans of Population Breeding Cycles from Cycle to Cycle for Major Species Breeding on Howland Island 
Species __ 1963 1964 1965 1966 _ 
Red-tailed Tropicbird Ap-May 63 - Jan 64 Apr-May 64-May 65 March 65 -Oct 65 Mar-Apr. 66 - Dec 66 -Jan 67 
8-9 - months 12-13 months _ 7 months 8-10 months 
Blue- faced Booby- 
Brown Booby 
Red-footed Booby 
Great Frigatebird 
Lesser Frigatebird 
Sooty Tern 
