I saw my first Glow worm (Lampyris noctiluca) larva last weekend at the Merthyr Mawr National Nature Reserve, though I admit to thinking it was a caterpillar of some kind at first glance and needed an expert – luckily, I was with one! – to explain my mistake. Even more luckily, my expert Mike has two sons who are wildlife-obsessed and extremely talented young wildlife filmmakers. So, rather than attempt to tell you about this fascinating little insect myself, I am delighted that Rudi and Finn have very kindly agreed to let me link to their video. This is a must watch!