i've captured 12 swarms so far this year, had 4 swarms move on before i arrived, & have done 3 removals from buildings. 1 swarm was a repeat from a location i caught one from last year. i got 6 calls for swarms that were too far away for me to go to. i know of 9 feral colonies in trees within 12 miles of my house. so around here anyway there seems to be a healthy feral population. i'll prevent my hives from swarming if i can.