Urine, fish, mice, muskrat, and possibly a few other things. You better have a very strong foot trap as well. We always lose a few a year. They are very smart animals so you may have to bait for a few times before setting the trap. I will tell you though, since you are just starting out, that you should ALWAYS get permission from the owners of the property before setting the traps and make sure you have your Fur Harvester License. We've caught a few dogs in traps and have had a lot of scuffles with "walk on" trappers on the land we trap. We have came out on top with these instances because we had permission to set the traps. I know all the farmers in Weber and they let us trap their land year round. Trapping is becoming more popular so it's always necessary to take these precautions.
A BAD DAY AT THE MARSH BEATS A GOOD DAY AT WORK.