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Updated: May 19, 2025
They are found only at the surface of the water, where the temperature must be above the freezing point. In February a few double-winged water-flies, which swim down the stream, are usually found in the middle of the day, such as the willow-fly; and the cow-dung-fly is sometimes carried on the water by winds. In March there are several flies found on most rivers.
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