Could be bullfrogs, snapping turtles...fish, if the pond is big enough for big fish... Or it could be cats or avian predators. Ducklings are on a lot of menus...
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"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."
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