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Echolocation? Not just for Bats. Oilbirds and swiftlets are two avian groups that utilize the power of sound to nest in dark caves and tunnels. https://t.co/5ccpajOmXF Photo credit: wokoti, CC BY-SA 2.0 https://t.co/sTHY3SoTX4 #featheredfactfriday #bi
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