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It's nature in action in the turtle tank. Turt has reached the size where he can hunt the minnows down, and so he reduced the tank population by half.
In return though, the latest batches of minnow fry got too large for the big fish to eat, and so young ones are repopulating the tank.
I watched Turt fishing last night, at his perceived dusk; he hangs on to something solid and waits for fish to swim close to his motion-sensing beak.
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