I am interested in finding out mice and their living habits together in a colony, such as how many?

Hello fellow mice trappers! Well I've tried the humane way, and now we have decided on the slap traps. I now call my husband "Trapper Moe". I've been reading some answers to mouse in the house problems. We've lived here for 13 years and never had mice. Trapper Moe caught 15 mice in two days!!! It's becoming hysterically and shockingly gross! I'm more interested now on their living quarters. Are they buddies? It seems they are extremely intelligent. It's also fascinating, but I disagree with the woman about the fact they have no pain. Are there any experts mice hunters available to answer?