Around two years ago one of my guppies gave birth to a male that could change color. I've looked all over the internet and could not find another account of a guppy that could change color. Its tail was usually yellow, but it would often change to blue, pink, black, orange and pink at the same time, even white. It is a trait I've only seen in feeder guppies (I just saw a few in the alligator snapping turtle tank in the San Diego Zoo when I went there on a trip). One way you can tell that they could change color is that their tails are completely one color (usually yellow or light blue). If everyone could start looking for them we could start a new guppy strain, and save these extraordinary guppies from being fed to other fish. Also, if you find some, try breeding them with fancy guppies. I tried, but all my guppies died before any babies were born.