I like wildlife, but this is taking it too far?

We collected the motorhome from storage today and found this part built birds-nest on top of the oil filler cap when I had a quick look under the bonnet.   Probably quite recent as it wasn't there when I last looked in February.   A wider view in the extra.

Off to Malvern/Ledbury at the weekend to see our daughter's family and deliver the pink bike .