Bluebottle Calliphora vicina
The Bluebottle deposits its eggs in rotting meat. The eggs often hatch instantly. Even though there are a few similar species, they are so hard to tell apart that most people use the name Blue Bottle without worrying about the exact species concerned. Actually in most insect guides Calliphora vomitoria is shown as the best example of a bluebottle. But chances are you'll never see it, for it has become rather rare. The most common bluebottle, especially in gardens is Calliphora vicina, which has the face rather reddish brown just below the eyes. Calliphora vomitoria has an all silvry grey face.