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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.

four large snails doing something

four large snails doing something

four large snails doing something

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    $\begingroup$ The middle two, at least, are having sex with their love dart. $\endgroup$ – vkehayas Jul 1 '18 at 16:54
  • $\begingroup$ @vkehayas ouch! $\endgroup$ – uhoh Jul 1 '18 at 17:02
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    $\begingroup$ thumb up for snails love $\endgroup$ – L.Diago Jul 1 '18 at 22:28
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These are probably giant African snails, Achatina fulica, an invasive species of land snails. The two snails in the middle are mating using love darts. The other two maybe wait for their turn.

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  • $\begingroup$ Yikes again! A top 100 invasive species, spreads human disease, and a delicacy according to Wikipedia. $\endgroup$ – uhoh Jul 2 '18 at 14:53

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