Cabin December and January

I have been up to the lake every weekend since Christmas.  I have set out a few traps with my nephews, we are trying to catch Martin and ermine.  I have also put out a couple of Beaver sets next to an active beaver hutch.  We have had three martin in our sets and they have escaped.  I have caught one ermine and two beaver.  The temps have been from +30 F to -20 F on our trips with 0 to -5  being the norm.
We have caught a few pike, most trips are overnight and we have not set tipups out, be we did catch a 38" in Pike in Late December.