24 km SE Mogileon, Buenos Aires Prov, Argentina March 18 left 6:15 a.m., with class. Set up grids at each end of the grazed pasture (sheep, cows, horses) singing 10 a.m. Scattered clouds and brisk breeze. 20m 20 at about 1:30 started counting fresh 20 [illegible] Prenterkin burrows, not much singing at this time 20 [illegible] Boing but later in afternoon when wind died 20 [illegible] Balfin down there was much singing. Tried 20 Place localizing some on grid. Song lasts about 15 seconds and includes 30 to 75 notes, more rapid towards end. Evening clear, calm, moon and night past full. Tweez song (bats) until after 9 o'clock. Many would sing for a time, then quiet, then more singing, almost no singing in the morning. While localizing the sounds, certain individuals appear to have sung 3 or even 4 times in the ± 2-hour period (but never twice in succession) March 19 morning clear, windy. Set 24 tree traps in the start 7:30 dark only; then marked burrows on the census area 8:30-9:30. Ran traps at 11 a.m. = 11 traws. after lunch hunted for effe/tyto burrows & pellets. The one in our pasture that had parents and young Dze.27 is now abandoned and covered with grass. There is another one close to the ranch house. It had a bird near it March 14, [illegible] when we arrived here yesterday, and early this morning, but this p.m. it was closed and no bird; but a few pellets. The field with the others (all not for Dze.27) has been plowed and