Coat Hanger Nests//
　　Closer to home,/since around 2005/Tokyoites have been watching a remarkable experiment/in social learning among crows.// Ordinarily,/crows use twigs and natural material/to build their nests.// However,/natural materials are hard to come by/in the busy city,/so the birds settle for the next best thing:/coat hangers.// The first photo of a coat hanger nest/was posted in 2005.// Just as lobtail feeding began with one humpback whale/and then was passed on by social learning,/so coat hanger nest-building/has passed to another generation of crows.// There are now so many coat hanger nests/that they are becoming a problem.// When the crows build nests on power poles,/it can cause electrical shorts.// The electric company has to send out crews/to take down the nests.//