Upon reaching the end of a branch, the snake continues moving until its tail dangles from the end of the branch. It then makes a J-shape bend,[7] leans forward to select the level of inclination it wishes to use to control its glide path, as well as selecting a desired landing area. Once it decides on a destination, it propels itself by thrusting its body up and away from the tree, sucking in its abdomen and flaring out its ribs to turn its body into a "pseudo concave wing",[8] all the while making a continual serpentine motion of lateral undulation[9] parallel to the ground[10] to stabilise its direction in midair in order to land safely.[11]