- shrikesthatimpaletheirpreyonthorns.Researchersobservedonebirdimpalearodentonacactus.It'sasimpledevice-twoboardsandanailonwhichtoimpaleacorncob.Singingamongthesavagebranches,itimpaleitselfuponthelongest,sharpestspine.Thecruelkingusedtoimpalehisprison...
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