I saw this bunch of tiny roots or grasses creeping up our wall in the S of France. When I got closer he retracted his head into his 'house', but after a while he came out again and continued to creep upwards. His action seemed a bit like a caterpillar looping his way along rather than any other insect. He has some stripes and the overall length was about 3 -4 cms. Can you identify it please?