Pama Mch 30. Spring Creek. fly to a large stump in clearing to E. My guess was that incubation was underway and that the F had returned to that activity. The M did not sing as other love males seen earlier. I drove W to the area where I had hunted 8:05-8:35 and worked through the open post oak (with occasional blackjack oak) from 10:45 - 11:05 - no advance activity. There is a remote possibility that this bird may have abandoned the territory. I fired a gun in that vicinity at 8:00 and again just before 11:00 shooting at Nyctidromus; this might have frightened the thrumer into silence. The wind increased after 9:00, blowing loose oak leaves along the ground. Mch 31. CLOUDING IN, CALM. I reached N-S trending fork of creek at 7:15 and crossed, working S on E bank. Exchange of song peto -- from S of area where I had worked yesterday but silence by 7:25 when I crossed gully. I worked farther S in that cleared area then turned W toward the creek and circled N across gully and back into Territory near road at 7:30. BREEZE from E at 7:45 - Roads had cleared. At 7:55 I was standing under post oak 75 ft N of snag where I thought nest might be - I heard Teit and then song peen --- and saw a perfect Black-cosied T.Thrusae with food in beak in top of that post oak. He shifted perch uneasily, then flew E to twin persky