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Here's the deal.... herons won't eat fish from a pond that they can't wade into. Sloping sides, steps, ledges in a pond = heron problems. Sides that go straight down & are deeper than a heron can stand in = no heron problems.
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“In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. I cannot recall the last time something like that happened in politics or religion.” ― Carl Sagan
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