You can't really tell from the photo how big this bug is, but it is one huge wasp with an amazing reproduction strategy. 

By the way, they live less than two months as adults and rarely sting humans. Seen yesterday near the Butterfly Garden and in Harrier Meadow.

Oh, yes — the amazing reproductive strategy. The female paralyzes Cicadas, lays her eggs inside, and then buries them.  More on Ciacada Killers here.