Even when we think we know everything, or that we think we have a grasp on what species occur in our environment, we don’t,” said Declan Morrissey, a zoologist at the Smithsonian.

A single polyp found during a flexible sigmoidoscopy exam will usually lead to follow-up colonoscopy to look for other polyps. Then, once the colon is "clean" of polyps, experts recommend repeat ...

If a doctor discovers colon polyps, they will often remove them and test for cancer. If cancer is present, cancer specialists will outline a treatment plan, which may include surgery, chemotherapy ...