dog strangling vines - growing in a ditch near you - David Sims

If you have read this far, you are probably a veteran at web searching. Here's a new one for you. Open your search engine and type in dog strangling vine. You will learn there really is one. Its a relative to the milkweed that Monarch butterflies thrive on. The difference is that it grows as a flexible and tough vine. Animals can run into a patch and become ensnared. Wikipedia has a good description with photos. This is another example of an invasive species that we need to work on eradicating.