DARWIN BAY on Tower Island was iormed when the side of an ancient vol- 

 cano blew out and the sea flooded a mile-wide crater. There are ledges and 

 reefs around edges of the bay but none has plumbed bottom in its abyssal 

 center. Thousands of marine birds nest on the island. The remarkable pic- 

 ture at left shows a hungry Man o' War snapping a shiny anchovy from the 

 water with its long beak and illustrates how this marine bird subsists on fish 



without alighting upon 

 the water. The male of 

 the species has a wat- 

 tle-like pouch on its 

 breast which it can m- 

 flate like a toy balloon. 



