burrows are found under and around clumps of grass or under beach magnolia bushes (Scaevola frutescens). These rats do not inhabit areas containing no plants. Rats were found on Engebi, Biijiri, and Rojoa prior to Mike detonation. After the shot they were taken on Bilijiri only and were 111 and lethargic. that any rats survived There is little probability on Engebi; for it was denuded by the heat and shock wave, then partly inundated by water waves from the blast, and had a radiation reading of 11 r/hr two inches from ground level for beta-gamma seven days after the detonation. That there was little chance of animals surviving is Lllustrated by the fact that the sole bird found on Engebi post shot had been blown to pieces by the shock wave. Birds were collected at two stations, prior to Mike detonation. Igurin and Rigili, After the shot they were taken at eight stations and, with the exception of two stations, con- sisted entirely of terns (fam. Laridae). Within this group the fairy tern (Gygis alba) and the common noddy tern (Anous stolidus) were taken when available. These two species usually remain close to the nesting grounds, although they may forage over &@ range of several islands in search of food. Other terns taken included the sooty tern (Sterna fuscata), the crested tern (Sterna bergiit) and the arctic tern (Sterna paradisaea). All birds were collected with a shotgun. The food of the terns inhabiting Eniwetok Atoll consists almost entirely of small live fish caught near the surface - 62 -