Our pond is the breeding area for mostly Leopard Frogs, but others as well.....which, naturally,....attracts those critters that love the taste of frogs...including racoons, herons, an occasional Red-Tailed Hawk....and of course.....ssssssnakes. They're mostly non-poisonous....but every once in a while,...I find a Water Moccasin....which won't do because of our 4 legged kids. Calls for a 20 gauge solution.
The sssssnakes we have to be most careful of.....(not too surprisingly)....are the gecko / toad / tree frog - eating Copperheads
The geckos/toads/tree frogs are in the middle of the food chain....the bugs attracted to our porch lights being the bottom