Muskrat,,,,,, I do at times set a "beaver Basket" up to jump into the water as you stated above.......Pain to get it out though....There is a New Double door beaver cage made by a guy here in WA that i will be experimenting with this Fall.....Iy should catch otter as well.
Water caging is what I like to do!!!
Dave Grey,,,,,If folding traps are not a priority on your line, I would look at "Other" models besides the Have harts. I have used them and without constant repair and adjustment you will have problems..........Pm me I have some good cages (similar to the williams design) for $38 with $10 shipping if you spend $100
As far a coyotes in a cage......I an working on that one.....It is a "basket" design trap.....I Just need to get the weight and the cost down