Flying snake is not actually flying. It glides from tree to tree using the speed of fall and its body’s contortion to catch the air and generate lift.
Flying snake will slither to the end of a tree’s branch until its tail dangles in a J-Shape from the branch’s end.
It propels itself from the branch by thrusting its body up and away from the tree, flattens to about twice its normal width, and turns its body in a pseudo concave wing, which can trap air.
By making a continual serpentine motion of lateral undulation back and forth, the snake can stabilize its direction in mid air and land safely.