was down to parkade at noon,a falcon was sitting on south east roof corner Mckenzie building,looked to be a different bird than we have been seeing since february 2nd she was eating dinner,no other bird around so I went home.RCF called about 1pm she said there was a falcon sitting in the nest box so back I went. THe falcon was still sitting there. We watched for a while (we were in a parking lot north side of Pacific) and then went up to the parkade, Falcon still in nest box and we then spotted another falcon sitting on mts tower. This one was very sleek and neat, very white breast and silvery grey back,also a lot smaller than bird sitting in nest box. He sat there just looking like he owned the place and finally flew to decoative ledge and proceeded to pluck a bird (feathers looked like a gull) the other falcon continued to sit in the nest box and would disappear inside at times and I'll leave the rest of the story for rcf cause she's going to check again before she goes home. Falcon was still in nest box when we left.