When camping on Dartmoor at the start of January this year, in sub zero temperatures, my 7 year old daughter found a worm climbing up a frozen waterfall leaving a slime trail that glowed in the moonlight.

What sort of worm is this and is it common?

Recently during a cold snap (-10°c) we were walking in the snowy woods in the Heidelberg, Germany hills and found about 20 worm like patterns melted in the snow. Some were several meters long and the melted paths never crossed. How or by what were they made?

You can get an idea of the size by my clomping size 13 boot in the picture.

Ian