I am building a chicken pen and was wondering what kind of wire to use? I've heard hardware cloth is better than chicken wire for keeping predators out, but what gauge would i need? would a wire with 1/2 inch by 1/2 inch spaces be small enough? It also says 19 gauge. We have some pretty bad predator problems in my area, they've killed 5 clutches of chicks already and many litters of kittens that we haven't found in time. How high would the wire need to be to keep chickens in and other anuimals out? Is 3 feet high enough, or do I need to go higher?