 So constrictor snakes climb trees by coiling, extending, coiling, extending, coiling, extending. And corn snakes, aka rat snakes, climb using concertina and lateral undulation. So that's the slithery S and slinky shapes. As my new snake friend is hopefully going to demonstrate. With the help of zoo owner Scott Adams, Mark presented our corn snake with a tree. Might be more in the mood to go down and lie underneath something. Let's see, come on. Oh.