When I first started using digital photography I bought a small Olympus camera which I could carry around in my pocket. To get used to the camera I tried it out in the garden at home and one of the first things I tried was the macro facility. The photograph below was one of the first I took and it's of (I think) a common green bottle fly, or Lucilia sericata.
I was pleased with this photograph as flies tend to buzz about a lot and it's difficult to get them to stay still long enough to get a decent photograph. It's much easier with slugs and snails and the like which are much more sedentary. I think the slug shown below is simply known as a black slug, or Arion ater.
Or, for a closer look:
