Why are Scylla danger?

Scylla is considered dangerous in mythology because she is a monstrous sea creature that preys on sailors and ships passing through the Strait of Messina. With multiple dog-like heads and a fearsome appetite, she snatches crew members from vessels, creating a perilous passage for those attempting to navigate between her and the whirlpool Charybdis. This dual threat symbolizes the challenges of navigating treacherous waters, both literally and metaphorically, in ancient tales.