i’ve added this little animated gif to the respective gallery:
![female glowworm (lampyris noctiluca)](http://www.thinkoholic.com//media/2007/06/08/070608-221201.gif)
female glowworm (lampyris noctiluca).
ony the (wingless) females are able to produce light.
it shows the same glowworm at “usual” lighting, and with a little more light so you can see what the bug itself looks like.
although they are called glowworms or fireflies, this really is a species of beetle.