When we put in our koi pond in the back yard it attracted a lot of wildlife. We have a lizard (actually it is a skink) that the juveniles have a electric blue tail. It looks like a neon light.
We also have some tiny little snakes that are not much bigger than a worm. In fact they eat worms. The worm snake is a Carphophis Amoenus
It is amazing that they can survive a winter.