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Pietro, surely you have a great place for them! Try to rear some caterpillars in a closed and medium-size recipient. Some of them could be parasited by tachinids. It's a good way to see tahcinids and knowing some relationships between tachinids and caterpillars. Sometimes you can find ichneumonid or braconid wasps. Also see the fantastic site of Chris Raper here:
http://tachinidae... -- and go to the downloads section... you have there very good material to begin with tachinids.! Enjoy the Diptera world!!! :D