Help. Ive been losing eggs .couldn't figure it out for a long time. then found a 6ft bull snake in the nest box. i disposed of it post haste . but my daughter said she saw another one, bigger than the first.found one of my pullets laying dead at the foot of the nest box. my coupe is fort Knox, ore so i thought. new to Oklahoma.I can build a bear proof coop but how do i defend against snakes ?help