I have a pond and some geese every year when it freezes over I loose 1-2 geese to predators. Not stay dogs, carcases are carefully eaten not mauled. It always happens a couple nights after the pond freezes completely over. What ever it is keeps good tabs on the pond. I know I have a healthly population of coyotes have not seen any signs of bobcat or fox. I'm going to put up a snare line. Don't know which are best. What are wammys. Which are better locking device (washers or ???) Any help would be appreciated. Thanks.