Snakes are escape artists, but I have clips on the top of my tank and this secures the top. Some people put bricks on the top of their tanks and this secures the top too. It has been said that no matter how nice the setup is, the snake will escape when given the chance!
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1.0 Corn Snake (Snakey)
0.0.1 Ball Python (Sosa)
0.0.1 Pine Snake (no name yet)