Depending on the owls, this could work out. Barn owls are 12 - 18 inches, so you’d only need 100 - 170 of those, stacked. They can get cranky, though, so they might have to be glued together, or maybe welded? They’d still flap a lot, which might scare the shrews. But maybe the shrews could be blindfolded, and sedated. I know in the 1960s Psychology-types used to inject rats with morphine and have them run through mazes and stuff. Surely a low-dose opioid could calm the blindfolded shrews to the point that the flapping of welded/glued barn owls wouldn’t disturb them too much.
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