I learned never to approach them as they are usually near a body of water. If they are going to attack you they are going to drag you into the water where they have the advantage. My house is not very close to the nearest pond in our community and I was shocked one day to see one of them lounging in my driveway. They are so prevalent that animal control came quickly and removed him for relocation to a less populated area that he will enjoy.
Same!! We have one in the retention pond where I live. Still small so not a nuisance yet. The problem is convincing neighbors feeding it is a bad idea.