I found a dead stag beetle about 18 months ago and it has been in my freezer ever since. I tried stacking it with both flash and ambient light (not really natural as I was inside but it was no artificial light).
Natural light (13 seconds per exposure, possibly should have been more)
Stag beetle stack IMG_0231 by davholla2002, on Flickr
Flash
Stag beetle IMG_0211 by davholla2002, on Flickr
Natural light (13 seconds per exposure, possibly should have been more)
Stag beetle stack IMG_0231 by davholla2002, on Flickr
Flash
Stag beetle IMG_0211 by davholla2002, on Flickr