Some Amazonian plants, for example, can shift as necessary between treelike form, when they receive sunlight, and a climbing vine, when they find themselves in shade. Others can transform themselves into trees once they reach the canopy, abandoning their host and winding their viny stems together into a trunk. While most plants naturally seek the sun, other Amazonian vines have adapted to seek out the dark bases of large canopy trees that might offer reliable support, and only then to turn upward toward the light.
