Pets are less likely to be aggressive toward? one another when they are contented in their environment. flexi-Vine formations add a natural and familiar look to an animal or reptile habitat. Flexi-Vine are a superior alternative to real wood because they can bend to fit any configuration, will not rot, are non-toxic to reptiles, and don't absorb pet wastes. Flexi-Vine do not contain insects or contaminants as real wood often does.