Anacondas move/crawl the same way other snakes move/crawl. Their long, thin bodies are almost entirely made up of muscles. Those muscles move in a wave-like motion, beginning at the front, ending at the tail. They also use little folds of skin called "scutes" on under side like shovels to dig into ground, and push forward to move. Anacondas are tropical snakes, and there are no anacondas native to the United States. Also, I believe they live primarily in the water. Anacondas, like Boa Constrictors, squeeze the life from their prey, then swallow it whole. If you ever have the opportunity to watch a Sidewinder (very poisonous snake) move, you may be able to get a more clear picture/understanding of the movements. I saw a very good picture section of snakes a couple of months ago on the internet. I didn't write down the web site, but I bet they had every kind of snake you can think of naming! With a good web site search engine, you can find a good site that has pictures worth more than a thousand words! Hopefully, when you find a good picture internet site, you will find a good, scientifically described, but clearly worded, site bare of anything but snakes!