 Incredible. Just seems to be defying gravity. To help me wrap my head around how a snake can behave like Velcro, Mark peeled the snake off the tree and showed me his belly, so I could see his ventral scales and those ridges he was pushing into the bark. There's the big belly scales, the ventral scales, ventral meaning underneath. OK. And they go right across and slightly up the side before they meet the first dorsal scales. And a little way in, there's a ridge. There's a ridge. You can feel it with your finger.