I've been trapping for the last few years, mostly Marten, and doing all right. But I've run into an issue lately I'm hoping the veterans here can help me with. I'm using coni's in cubbies (boxes and newspaper tubes) and the vast majority of my catches have been good "suitcase" types, neck and chest. But the last couple catches were caught well back of optimal just ahead of the hips in the stomach area. Any ideas on why they are now getting so far into the trap?