Had a call at dusk today. Swarm on the ground. When I got there, they said they had been there since the 20th. 11 days on the ground. It was still a good 3 lb. of bees. I set the box down at the edge of the swarm and they began the march. I loaded the box at 10:15 and headed home. First swarm I have ever caught at night, and surely the first I have ever heard of staying in the middle of a well manicured yard for 11 days. I will check in 3 or 4 days for eggs. If I find them, it will be a total surprise. I expect them to be queenless.