What on earth is this badboy?

Saw this this morning in Denver. Anybody know what it is called and its MO?
http://imgur.com/4OYK0
thanks!
s-a
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In article

http://bugguide.net/node/view/6945
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And just so you know, that is NOT a stinger
That is a female wasp not capable of stinging- the long "tail" is actually an ovipositor. She uses it to lay eggs, and you want as many of them in your garden as you can get. They lay their eggs in grubs and catepillars, and the wasp larvae hatch and kill the grubs.
Chris
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