R.D Kirkpatrick 1964 Mus musculus Sand Island Johnston Atoll Pacific Oct. 20 placed in two lines through the most heavily vegetated part of the island (at east end of causeway) to see if the mice will use them. 4 P.M. A sick mouse was tagged (but not given a collection number) and frozen. It may have been dying from Warfarin. No ectoparasites were noted. Oct. 21 1 P.M. The dropping boards were examined. They were wet and soggy since it was raining. One mouse scat was on each of two boards. Either rain had washed away the other scats or mice did not use the boards. 31 mice were found in the 48 traps on the grid. 9 of them had not been trapped before. 8 of the 9 were toe-clipped. The ninth was not since it seemed weak and chilled - it was released. Oct. 22 27 mice were in the 48 grid traps. 7 of them had not been trapped