ellenscoop
Songster
PoultryDVM has a predator identifier tool which is useful for this
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Dan, first off welcome to BYC!!
I too am in East Texas over near Crockett. You had a visit from a raccoon and I am willing to bet the other chickens escaped the coop the same way the coon got in. They were/are scared as all get out!!! They may show back up once they have calmed down.
Like has been stated 1/2 inch hardware cloth (19 gauge- good; 16 gauge- better) properly affixed will keep most critters out. 1/4 inch hardware cloth generally is not as strong as 1/2 inch. Find where the coon got in. Look your coop over with a fine tooth comb.
Good Luck
David