or unexplained scene is actually a natural reproductive behavior.
The creatures are red slugs, and the unusual interaction is part of their mating ritual.
Their hermaphroditic reproductive system makes their biology particularly fascinating.
Conclusion
The strange creatures shown in the viral photograph are red slugs, including the species commonly identified as Arion rufus.
The unusual behavior is related to mating.
Because red slugs are hermaphrodites, two individuals can exchange sperm during reproduction.
What may initially look strange or even alarming is therefore simply one of the many fascinating reproductive behaviors
