that is a mighty fine blacksnake you have there. I live on the river and have blacksnakes and watersnakes visit often. Killing them was futile. If I kept the grass constantly mowed, basically making the living conditions for small animals less than desirable, the snakes left with the small animals (frogs, lizards, moles, etc). I also have 2 hawks, an osprey, and 3 eagles that keep the place under control too, but for me, keeping the grass down was key.