They mostly come out at night...... mmmmmostly. I've had wanted to make one of these Aliens since I was a kid. I tried using clay, but they never turned out so well. Who know I would eventually pull it of with bottle caps, wine corks, plastic forks? The larger guy is about 8" tall and took over a week to make. The smaller guy is about half the size. They both heavily feature Lickinghole Creek Caps.