Common Gallinule or Moorhen, look like black ducks but are not

These are the very common (but not to me) Gallinae or Moorhen. They inhabit marshlands from Chile to Canada. I found these grazing in a pond in West Palm Beach in a very nice sunny day. Only when I got close enough to these birds did I notice that they were not ducks but in fact some bird I had never observed before that resembled black doves whith red beaks with yellow at the tip. You can read more about these birds at the Cornell University All about birds webpage.