The loggerhead turtle feeds on the Portuguese man o' war. It is a common part of the turtle's diet. The skin of the turtle is too thick for the man o' war's sting to enter and launch its venom. The sea slug "Glaucus atlanticus" and the violet snail "Janthina janthina" also feed on the Portuguese man o' war. The blanket octopus "Tremoctopus" is immune to the venom of the Portuguese man o' war. The blanket octopus has been known to rip off the man o' war's tentacles and use them for defensive purposes.