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they do not need to be hungry they are quiet bloodthirsty like a weasel , the best bait would be part of what they had already eaten put into a hole in the bank guarded by a 120 conibear type trap mink gland lure most times will cause a territorial response asa lennon makes some good lure they are available at most trapper supply houses
I have never known a mink or weasel to not make use of at least the blood of their victims and if left alone most of the rest of them.
True it may take a bit of time and they may kill a good number at once, they can and do cache and revisit their kills to eat what remains.
That is why that duck was partially in the hole and folks find chickens pulled into tunnels in dirt floored coops and easy to infiltrate runs and why it is easy to catch them in the same spot they killed by using what is left of their victims.
There are very few predators that exclusively hunt at night, a large number hunt around sunset and sunrise. There are a number such as mink who are found happily fishing in the middle of the day. We had one in the pond here that was frequently seen going after trout or swimming late morning early afternoon.