Forty-fifth Progress Report - - - Sure Atoll page 4 
this period* The minimum was 6 . Most counts, as last period, numbered 
between 150-250. Nests in tho study area decreased from 48 to 27 during 
the period, mostly due to mortality of chicks. Overall chick mortality 
from the first hatched on May 31 to present has increased to 64 percent. 
The mortality for the period is 94 percent. Survival of chicks in periods 
are* 
May 31-Junel5 
June 16-30 
July 1-15 
July 16-31 
7 of 9 hatched survived 
2 of 12 « i! 
6 of 20 11 H 
6 of 18 " « 
Some tropiebird chicks in areas oOier than the study area fledged during 
the period and others are nearly ready for departure. 
Six Blue-faced Booby chicks in the north antenna field fledged during 
the period at the ages of 99* 114, 115* H?> 117* a nd 125 days. They leave 
the area periodically, but all, including the one that fledged last period, 
return to the anteana field. 
There are presently two Brown Booby nests,one in each antenna fielu. 
with a pair of young. The age of the pair in the north antenna field are 
19 and 22 days. All are faring well. 
The frigatebird population has remained stable, but the red-footed 
booby population has increased slightly. The most noticeable increase 
being in the immatures and subadults using the island. 
Three Red-footed Boobies were observed with orange leg streamers during 
the period. On July 16 an adult with a very recant streamer was seen riding 
the air currents along the southeast beach. An immature was captured un 
the north roost on the night of July 22, but the previous band had been lost. 
It did not have complete use of its right leg which was smaller than normal. 
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