 because you anchor his tail, and it can reach out. If it doesn't make it, it just falls down, but it's saved by its tail being coiled. But you see, it can lift itself up, it's got tremendous strength. The heavier the snake, the more difficult it is, but a lot of the truly arboreal tree snakes are very slender indeed, and they can reach out across a gap. The corn snakes here in the zoo aren't true tree snakes, like the ones Mark just described, but they can still do impressive things with their tail, as our showcase snake demonstrates.