My first set of chickens (BB Reds) were killed by a raccoon. I live in a rural area surrounded by corn fields and woods. Last week my husband was standing out by the pen and a mink ran up from the woods. It came all the way to the pen before it saw my husband, then ran off. The pen and coop are now critter proof, but I'am afraid that the chickens could be scared to death. Any pointers on keeping these critters away other than an electric fence?