Like the flamboyant cuttlefish, the siren was poisonous. Not venomous; poisonous. The flesh of the creature was relatively inert, but the mucus it secreted contained a complicated mix of anticoagulants and neurotoxins, designed to slow and sedate anything foolish enough to bite it. Whatever ate a siren would become prey to the rest of the school, unable to build up the speed to escape them.
