Matney Photo-Comstock 12x15x33 Swim Through Beaver Cage TrapBy Comstock16 / November 8, 2014 Mike sent this photo of the smaller sized 12x15x33 Comstock Beaver Cage in action with a 40-50 pound beaver in it. So glad to see how much he likes them. He uses the floating repeater muskrat traps he invented and also colony traps.