Megarhyssa

 This fearsome creature was bravely photographed by Chris Barnhart.  It is Megarhyssa macrurus, also known as the long-tailed giant ichneumonid wasp.  They have the longest ovipositor of any insect.  It is deadly....if you happen to be a Pigeon Horntail Tremex, Tremex columba.  Otherwise you have nothing to fear.

Pigeon Horntail-Wikipedia

The Pigeon Horntail  female, bores tunnels into decaying wood.  She uses her ovipositor to deposit two to seven eggs into dead and dying deciduous trees like elm, maple and oak.  The larvae burrow inside and feed on the rotting wood while the female dies.

Meanwhile Wikipedia says "female Megarhyssa macrurus is able to detect these larvae through the bark; they paralyse them and lay their eggs on the living but paralysed larva; within a couple of weeks the Megarhyssa larvae will have consumed their host and pupate, emerging as an adult the following summer."  

This just proves that many species that look dangerous are actually harmless.  That said kiddies, "don't pick up unknown insects with your hands, just like your mommy told you!"

For a deeper dive, check out this link.