AVIFAUNA 



219 



Fig. 1 White tem egg on a dead branch, James Island, July 27, 1971. [Photo- 

 graph by A. J. Berger.] 



Fig. 2 White terns in flight, Tilda Island, July 24. 1971. [Photograph by A. J. 

 Berger.] 



cussed in detail by Johnson (1973, 1977, and 1979), by 

 Johnson and Morton (1976), and by Hailman (1979). Many 

 other species have been recorded in Micronesia (Baker, 

 1951; Owen, 1977), and some of these certainly will be 

 found at Enewetak when more intensive field work is done 

 there. 



Several of the wintering shorebirds remain as 

 nonbreeding individuals during the northern summer breed- 

 ing season. Johnson and Morton (1976) and Johnson 

 (1979) discussed this phenomenon for five species. They 

 thought that such summering birds were first-year birds 

 that lacked the physiological stimulus for migration. Some 



