Protesters and civic groups took to the streets of Belgrade clutching toy ducks to denounce a controversial government-backed project along the banks of the Sava river which they fear will change the look of their city for ever, the 021 news website reported . The 3.5bn euro ($3.8bn; £2.5bn) project, dubbed "Beograd na vodi" ("Belgrade waterfront"), is expected to take over two decades, and see the construction of a business hub, some 17,000 residential units, as well as the biggest shopping mall in the Balkans, the Blic tabloid says . Belgrade's mayor says the project will help kick-start the economy and bring substantial benefits to local residents, but the marchers, with a 2m foam duck to the fore, chanted slogans denouncing "plunder" and saying "Belgrade does not want a bourgeoisie quarter on its waterfront."