Is it a bird? Is it a plane....?

or something more sinister?

As a painter (and specifically a landscape painter) I look at the sky ...a lot. Hoping to gain inspiration from the dramatic colours and expressive clouds..... however over the last year in a half I've noticed some very strange events, almost on a daily basis. I feel the need to mention it here as no-one else seems to be bothered by it, but it bothers me.