Check out these photos of animals images:
Mimikry?
Image by Reini68
This animal looks in so many details exactly like a wasp and still it's not. It even has the three dark flecks on the head, the german wasp has. It is shorter however and doesn't have the waist of a Yellow Jacket. I thought it must be a fly, but the eyes don't look like those of a fly and even less do the antennae. It is the size of a bee and it is all the time around in our garden which is in Eastern Austria, Central Europe - south of Vienna. Sometimes even attacking bumblebees who clear the field immediately (I've seen this twice).
Here are some other pictures of this animal:
www.flickr.com/photos/stansich/200144169/
www.flickr.com/photos/stansich/200142566/
www.flickr.com/photos/stansich/200141120/
www.flickr.com/photos/stansich/200141063/
