Pursuit 2
Both of these slugs are residents of our woodpile. I'd seen the leader (upper right) several times before. It is easily identifiable by its relative lack of spots. The follower was new to me. Having watched Sir David Attenborough's BBC series "Life in the Undergrowth" where the mating ritual is shown, I immediately knew what was going on when I saw these two slugs behaving this way. I had my PowerShot camera and a light with me, but I knew the ritual could take several hours to complete. I rushed inside to stock up on batteries. When I emerged a few minutes later with full pockets, the slugs had moved all of a half metre or so. The leader was crawling along with great care, making sure to thoroughly examine everything it came into contact with along its path. Particular attention was paid to objects that seemed to project upward, however short they might be.