Feb 3. 15 mi W Bastrop, 600 ft, Bastrop Co, Texas I left that pair of titmice at 10:35 and moved SE. within perhaps 25 yards I came to an opening and crossed it. In low elms there (15-18 ft) I encountered another pair of titmice. One gave a call see-like-pay somewhat liquid and carolina chickadee like. Contact not seen given. Appearance was about like the last pair. Call see see see given by one bird as I drew near - anxiety? . I watched one sit on lateral branch of elm acting as though "freezing" there in motionless posture. I waited, noticed, and soon the bird turned perpendicular to branch and eventually flew to next tree N. I left at 10:43. Then I circled to E and N to dry brookcourse. There about 10 yards upstream from small earth dam. I encountered a titmouse accompanied by 2 second. They flew W into a large elm, where a 3rd tit appeared and chased one to E, returning to elm himself. I could not follow events subsequently with understand- ing. There was a chase into smaller elms to SW and some further pursuit in tree tops. One bird seemed to be aggressor here and flew at other, essentially "approach- threat" with no display or notes but occupancy of perch at or near that of bird forced to fly. Note-sit- sit-sit-sit always accompanied such action and I was able to verify that this was given by bird being chased. I saw no bill movement of aggressor.