How to mirror geometry in Maya the new school way

So we got half a Maya model...now what? We mirror it over and merge the vertices, all with one command, to get us a solid object. We use the dolphin from our organic polygon modeling series, but the technique can be applied to any polygon model. Watch and learn how to mirror geometry the new school way in Maya (with the mirror geometry tool!) NOTE: there are often problems with this method of mirroring, but don't worry, they're covered.