It鈥檚 nose to tail
While on holiday in north-west France on the 25 March 2010 I came across the line of caterpillars shown in the photo below. They were on the seafront road in Carnac, heading towards the sea, maintaining close head-to-tail contact. The only vegetation between them and the sea was some raised flower beds. Can anybody identify these caterpillars and explain their behaviour?
Bill Richardson, Johnstone, Renfrewshire, UK