Hiking in some hills near Taipei after a rain, I saw lots of large snails out and about. Here "large" means the shells are say 8 cm long, and the snail itself fully stretched out 10 to 15 cm perhaps.
At one point I saw a cluster of four snails stuck together in a confusing way. The one on the right was slowly climbing uphill, pulling the other three along.
What is going on here? I see some connections between some of the snails, but I can't really understand most of what I'm looking at here, nor why four snails would be stuck together sideways like this.