 The “Prati di Caprara Est” is a "wild urban woodland" (sensu Kowarik 2005) that is the result of a 
"spontaneous establishment of shrubs and trees that occurs in abandoned urban and industrial areas 
without any human predefined scheme".The dominant tree layer is mainly composed of pioneer species such as black locust (Robinia pseudoacacia L.), white poplar (Populus alba L.) and Canadian poplar (Populus x canadensis Moench).Some areas are dominated by young communities of tree of heaven (Ailanthus altissima 
(Mill.)