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Historical data are so scanty, that, for the most part, it is impossible 
to document changes in the avifauna. Nonetheless the avifauna has probably 
changed somewhat in the last century as a result of human activities and o^r 
mammalian introductions as on Howland Island (Sibley and Clapp in prep.) 
Polynesian rats have been present on Enderbury from %kc* "t?a:flli 
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human occupancy u&441 the 1940’s when the species was exterminated by an in¬ 
troduced population of cats. The cats, in turn,were present until 
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exterminated by POBSP personnel in the hope that Enderbury would 
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eventually support ana avifauna more similar to rnadBsmm^amSBSBBixkm. ****** 
Of the eight common nesting species (Red-tailed Tropicbird, Blue-faced 
Booby, Red-footed Booby, Great Frigateblrd, Lesser Frigatebird, and Gray-backed 
TernJ^have annual peaks in their reproductive activities. One (Sooty Tern) 
apparently nests every six months and one (Brown Booby) does not seem to exhibit 
any particular choice of breeding season. All six of the former species have 
a spring or summer nesting peak and the Sooty Tern has peaks in January and June. 
On Howland Island the period from July 1965 to February 1964 was unfavorable 
for nesting (Sibley and Clapp, in prep) and nesting success was very low. A 
similar situation was found on Enderbury Island during this period although it 
does not appear to have been as prolonged. 
