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i don't know which type of blue flies this is ..
thank you for the suggestion but I don't think it is a Green Bottle Fly ! ....
for the reasons :
*It has a nearly completely blue belly not green and the green thing is its chest.
*from wikipedia "slightly larger than a housefly" and this is not true for this fly because it is at the same size or smaller.
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I apologize for the length of my words..
Thank you again Victoria :)