Page Two (V.D. Diary-5/17/64) No mammals in traps or nets last night. Rain-forest trapping is ever thus! We are actually far ahead of the usual trapping luck in such habitat in the tropics, so I am not complaining. I know of some collectors who may only take one mammal in up to 300-400 trap nights! We did solve the mystery of the loud hyla-like calls which begin each night shortly after dusk. Tobram, Davida, Stan, Ken, and I crept cautiously up on the spot where one was calling, shutting off our torches, and waiting. The species sings at about one minute intervals. We finally circled the spot and then Tobram and I saw the frog on the ground. Stan tape-recorded it successfully. However, he is having battery trouble-guaranteed for 15 hours, but we are lucky in these humid conditions to get much more than an hour. The frog had dark spots on the belly. We had a few poor wing-shots at small bats--no luck again. We doctor-ed up some of our bait today: added some Australian "luncheon meat", rum, flour, and alcohol. Tobram and Davida set out new trap lines today. We keep certain lines in the same spot for the duration of a stay in camp. Museum bait, which I grind up and pack tight in pressure-lid paint cans at home, will last indefinitely in the tropics--at least, this has always been my experience. Tastes good, too!