Parts of oil-rich Venezuela are benefiting from high oil prices, but a significant number of poverty-stricken communities say they have been marginalised by the government.br br In the southern city of Ciudad Guayana, many members of the Warao community - an indigenous group which says it has not seen the benefits of the city's booming oil industry - have been forced to scavenge through massive trash dumps in order to survive. br br Al Jazeera's Rhodri Davies reports from Ciudad Guayana, Venezuela.