Field Notes B. A. Bell - At Pine Canyon to check on Prairie Falcon eyrie. Dorothy (the watcher) said The adults were ignoring chicks. May 18, 1990 Pine Canyon, near Castle Rock Park, Mt. Diablo St. Park, Contra Costa Co., Calif. Betty & Bob Gallagher. Everette Utherback. -> Watchers 16:43 PM - One entry to nest, sat on edge of Pothole, looked around. Sat ca. 10 min, then flew off. 17:02 - Falcon returned to Pothole. 17:40 - Suddenly both falcons appeared. Trierel transferred rodent to ?, she then flew into the pothole, the other bird sat on a pinnacle. After a while, the bird in the pothole came out and joined the other one on the rocks. All previous observations from above watchers. 18:15 : I arrived from after saw Trierel carrying food along canyon. Heard screaming. Didn't see any activity at pothole. I then hiked up to a vantage point in a rock pile. Watched eyrie from about 19:30 to 19:20. At ? 18:45 saw ? appear at left edge of pothole. She paced calmly (has crop) for [illegible], 20 min., then looked about for 5 min, then roused, turned and walked to back of pothole out of sight - to brood young. No other activity [illegible]. I left @ 21:30. The eyrie looks OK, no other aberrant behavior noted. The Peregrine people from Santa Cruz had removed 5 prairie Falcon chicks on Wed, 5/16, and placed in 2 two week old peregrine chicks (these from eggs taken April 10th. resulted from the Bay Bridge pair). The two Prairie eyrie is in different spot this year than last. The