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 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.