Killer Wasps

The other day I was watering the flowers and the biggest hornet I've ever seen flew out of the bushes and took of. It was the size of a humming bird and buzzed as loud as a distant lawn mower. Scared the crap out of me, insects have always given me the willies but get real, one large enough to carry off small children nearly gave me a heart attack! In the following days I encountered a few more, so on-line I went. After reading similar accounts and looking at photos I believe they are the "Cicada Killer Wasp" ranging in length from 1.5" to 3" or more and as fat as your thumb! The pictures I found online are of small ones and do not do justice to what I saw in my yard. I guess they are not aggressive to humans, but dang it I'm taking no chances!