9260,
The hardest for me to take out of an ADC colony is usually a female that has been bred. Most often a castor mound set won't work because she interprets it as a strange male being in her area and she isn't looking for a fight. If she gets killed in such a fight the pond will die. She most often will avoid strange castor when expecting young. The best way I've found to catch her is with the oil from one of her kits.I had one colony that I'd caught all but the adult female and the landowner drained the pond. I set snares in all the exit holes in the lodge and it took eleven days before she exited the lodge and I caught her. I also had one such female who wouldn't even repair a dam I broke open for 5 days. The water level dropped about 20" before she would go near the dam.
Got another 15 yesterday and will be pulling the line tomorrow. I took another two off the ADC colony and will leave them in place until I'm sure they have all been caught. The adult female in this colony may be tough to catch. I'm sure she's been bred by now and she hasn't shown any interest in castor sets. We'll see what happens at tomorrows check.
Weather is suppose to warm up and the beaver are starting to show some bites and weakening of the fur. I hope to have enough to tan with tomorrows run. Plenty to flesh and tack.