6. 13 June 1964 (Con't.) . Maximum old craters, whereas the Sooty Terns are around the island below this level. 3 Wedge-tailed Shearwater - Crater bottom filled, Women estimates 25,000 pr. Most now have eggs - 1 egg laid on bare ground - no adult near. 4. Bulwer's Petrel - 4 or 5 found, located by calling from burrow - with eggs. The throat is puffed out before the call is produced. All black petrels Flying over - saw few Red-footed Boobies - (White Tail) in area. Over Kampa - 5 Frigate birds were seen soaring. One curious Noddy characteristic - there Noddy young appears to be a polymorphism in the chicks, they being ? either pearl gray or solid brownish, & will try to estimate ratios today, but apparently it is 1:1. Selective advantages? Genetics of this?