Snappers eat fish, frogs, ducklings, snakes - whatever happens to swim by.
Other pond fish gourmets are bullfrogs, snakes, herons, kingfishers, raccoons
(they usually leave a mess behind so you know they were there).
Usually the bigger the pond the more critters can visit
without doing too much harm. When your fish start to overbreed the pond a few
predators can help.
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