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.