The Encyclopedia of Land Invertebrate Behaviour - Rod Preston-Mafham, Ken Preston-Mafham - Google Books

http://books.google.de/books?id=sDpagGxJw3AC&pg=PA222

Witness the dazzling mid-air copulations of slugs, the transvestism of dung beetles, the "lovedarts" of snails, the pre- and post-nuptial snack-smearing strategies of millipedes and centipedes, the dance of the scorpions, and spiders that tie their mates…