Lots of wasps around. No reason to be worried about these.

For the first photo, I was up close and personal (only inches away), using my 40mm lens. I moved very slowly, in hopes of not disturbing the wasps. There were lots of clouds, resulting in the white background. Or it may be overexposed.

Wasp nest in cow skull

The second photo was taken on a different day: fewer clouds, bluer sky, with my telephoto lens, 55mm-300mm.

Skull, wasp nest and sunflowers