What goes klank klank in the night?

Seems as if we have a pet at night?? I noticed a large hole dug out under one edge of the shed. I filled it up and later that night I heard a funny klanking sound, the shroud of the armadillo makes a weird sound as he slowly moves hunting for worms. I was prepared. I poured some Ammonia into the whole and then replaced the sand and added a little more ammonia on top for good luck, AHHA no Armadillo was here last night!!

The neighbors suggested that I manage to mix ammonia and chlorine in , in my line of thought I would gas myself with mustard gas ( ammonia and chlorine are among the ingredients) before I did in the little armadillo. I am still armed and dangerous with my ammonia we will have to see what comes back if it does and I wonder where the heck the neighbors dog is?