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In the flower fields of the Columbia Gorge, a blue-haired, spiny-looking cuckoo bee patrols, searching for other bees’ pollen-laden nests so that it can steal them for itself.

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PORTLAND — If you ate a Willamette Valley-grown tomato or pepper before the mid-’90s, there’s a good chance it was pollinated by the western bumblebee. The inch-long, white-bottomed bee — which you’d also have to thank for countless wildflowers — was one of the most common pollinators in the west. But around 15 years ago, they mysteriously disappeared west of the Cascades.