Heavy metals tend to bioaccumulation in living organisms. Their aggregation has been a noteworthy concern. The present investigation assessed the concentration of five heavy metals in the cestode Raillietina tetragona and Streptopellia senegalensis and in its host Cotugnia polycantha gathered from local market of Al-Nassiriyia City/south of Iraq. Samples (Liver, Kidney, muscle, intestine and two parasities) of 60 infected were chosen for heavy metals examination which achieved by Atomic absorption spectrophotometer. The results showed the bio concentration factors (BCF) in Raillietina tetragona is more than in Streptopellia senegalensis. The obtained results illustrated the probability of the utilization of birds and two parasites as markers of environmental pollution.

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