I have to say that I fully agree with the line of reasoning in the first post. I am certain that beavers have learnd to avoid my trap becuase they were they either when thier mate got gagged or because they accidentally tripped the trap while trying to repair the break I made in the dam. I know this becuase I have made sets where I caught a beaver on the first night and my guide sticks were knocked down where another beaver made a route around the trap. The follwing night, they would be knocked down in the exact same spot and manner. I've even had them move the dive stick up and over the trap where I had it hanging with wire. Either way, they are intelligent enough to figure out that the trap represented some sort of danger when it went off.
A couple of things I did to prevent these things from happening:
1.) Now, instead of wiring the divestick to the tops of the last 2 guide sticks and letting it hang, I make sure those last 2 guide sticks have a knot or small broken-off limb. I push them down to the point where I want my dive stick in the water and then wire the dive stick at each end around the 2 guide sticks, right at those 2 knots so it can't slip down or be lifted up and flung over.
2.) Instead of 1 trap at an opening, I use 2. I used to make a small break in the dam to get the water moving, then do my set parallel to the dam-not anymore, and especiall if I've already had one burn me. Now, I make the break and place 2 traps at 90deg. to the dam. In other words, I make out a 3-sided box, the dam being the 4th side, and place 1 trap on each side of the "box" perpendicular (90 deg.) to the dam. When I get a beaver that does not want to go through the trap and just tries to repair the break by letting debris go into it with the flow of water, the debris cannot collect in the trap. Eventually, he bites the bullet and has to go through on one side or the other to see why his crud just ain't stopping the water from moving. That's when he gets gagged. Also, this leaves the other side open to catch a follow-up beaver should one of his buddies come over to help. Also, because the first beaver is trapped on the other side of the "box", the second beaver doesn't feel like there is any danger in the route he's taking. This set up works very well. It's more work, but I've come to use it in places where there are large colonies and/or the other beavers figures out after the first night or two of seeing thier relatives getting snagged that there was something dangerous going on. This also prevents the occaisional burried beaver becuase thier buddies cannot stop the flow of water by just letting the debris go.
3.) Move the trap to the other side. If I'm in a place where I don't have room to set 2 traps at the same break and I get a beaver and can't seem to get his buddies, I just move the trap to the other side of the set-up. Sometimes after catching 1 or 2 the rest know what's going on. In this situation, I jsut move the trap to the other side of the setup and "kawham" I'm back in business.
I think I got a pick of the perpendicular set-up somewhere on my computer....