You'll find this occurrence on display at rivers all across the Colorado high country, where an emergence of miniature mayflies has touched off what may be the most dynamic surface fly-fishing event of the season.
This little bit of a bug is the baetis, better known and loved by its descriptive name, the Blue-Winged Olive or, for simplification, BWO. The beauty of the baetis is in its punch, the sheer strength to endure a cold weather lifestyle where other mayflies cannot survive.
In doing so, it serves a serendipitous function both for hungry trout and eager anglers. The season's first significant dry fly event features the perfect insect for Colorado, where higher elevation and a plenitude of tailwaters demands a bug tough enough to take the chill. This tough little bug also has the punch to produce two separate broods each year; rare among mayflies, it yields a second hatch almost precisely six months later, in late September and October — just in case we didn't have enough fun first time around."
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