Quest 1948 Journal 19 April 17 Cerro Prieto 30 ft 20 mi SSE Mexicali Baja Calif. Just before camping last night, Dr Benson saw an Ondatra zibethica swimming in an irrigation ditch (about 5:30 PM). Odon were seen and presumably heard gnawing during the night along the irrigation ditch. Dr. Benson caught a Macrotus californicus in an abandoned bamboo shack 50 yds from the canal and in a mesquite thicket about 10:30 last night. It was caught by a handnet while flying about within the shack. It was obviously very confused by the flashlight for it merely flew around the walls of the shack for five minutes while Dr. Benson tried to net it, not find- ing the many large cut holes of size of at a man's head or larger that would easily have permitted its escape. Five nighthawks seen flying from mountside yesterday at early dusk (sunset). Smelled a skunk while driving along a bamboo & Tamarisk thicket beside canal yesterday about 5:30 PM. A large saline pond was seen to contain about 100 Avocets late yesterday afternoon. The pond is located N.E. of the mountain and is about 300 yds long and 100 yds wide, ap- pearing about 1 in to 2 ft in depth range.