Portuguese man o' war
Aside from sponges, hawksbills feed on algae, marine plants, cnidarians, comb jellies and other jellyfish, sea anemones, mollusks, fish and crustaceans. They also feed on the dangerous jellyfish-like hydrozoan, the Portuguese man o' war ("Physalia physalis"). Hawksbills close their unprotected eyes when they feed on these cnidarians. The man o' war's stinging cells cannot penetrate the turtles' armored heads.