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Coenosia tigrina
It was killing another small fly.
Thanks a lot! It's a really interesting fly, too bad couldn't get a better photo to show its prey.
Wonderful spotting of this predatory fly! I know I gave you a link to a North American page but this fly is native to Europe, introduced to North America. I found these in my yard last year:
http://www.projectnoah.org/spottings/143...