Munro found birds on eggs oanf July 2 6 * 1938^and on May 30 c^/93? 
the -n^xt^yea-r Kinney banded 200 Red-footed Boobies. 
Population: On fWe of the s^en POBSP visits to Enderbury the Red-footed 
Booby population was estimated to be between 1100 and 1500 (see Appendix A). 
On the other visits in February and November 1964 the e^44 m at e4 popula- 
o <2/Vo\>€ < / 6 0(0 
Through 1965 adults had been banded and in May 
1965 approximately 50 percent of the birds handled were banded. Th4s^©u±d 
indicates that a population of about 3?000 Red-footed Boobies uses the island 
annually. Only about half this total is on the island during any given day. 
O VOosjevxsVoey^ 
Annual Cycle : Nest count data collected from July 1963 to N o v em ber jr 964 
indicate a regular annual cycle with a summer peak and with considerably 
diminished breeding activity in winter. In February 1965 many more nests 
were found than we would have expected from the previous data. About half of 
the 400 nests contained chicks which indicates that many birds must have 
laid eggs in December 1964. 
This nesting activity possibly indicates early initiation of the nesting 
cycle in 1965 or conversely may indicate that environmental conditions 
affecting nesting were different in the winters of 1963-1964 and 1964-1965. 
The latter possibility seems quite plausible since many more dead nestlings 
were found in February 1964 than in February 1965 . In any case these 
differences do not disprove the existence of a regular annual cycle. 
Table ~ presents the nest counts for each visit 
Red-footed Booby Nests on Enderbury Island * 
Table 
mid-Feb* late Feb* late May mid-July early Oct* early Nov. mid-Nov. 
1963 
318-209-49 
41 - 40 - 21 ? 
1964 
0 - 0-0 
113 - 144-248 — 
34 - 29-229 
1965 185-76-74 
202 - 43-146 
121 - 21-178 - 
" x “ The first figure is the number of nests with young* the second Is the number of 
nests with small young* and the third Is the number with large young* 
