Glaucus atlanticus

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Glaucus atlanticus, also known as the blue sea slug, is a nudibranch of the suborder Aeolidina. Its distribution is throughout throughout the world's oceans in temperate and tropical waters. G. atlanticus preys on the Portuguese Man o' War (Physalia physalis), Velella velella, the Blue Button (Porpita porpita), and the violet snail (Janthina janthina).

With the aid of a gas-filled sac that is located in its stomach, G. atlanticus is able to stay afloat at the surface. Due to the location of the gas sac the blue sea slug actually floats upside down. The dorsal surface, actually the foot and underside, is either a blue or blue-white coloration. The true dorsal surface is completely silver-grey. This coloration helps protect G. atlanticus from predators from both below and above.

G. atlanticus is able to feed on P. physalis due to its immunity to the venomous nematocysts. The blue sea slug will consume the entire organism. After consumption it will select the most venomous nematocysts and use them as a defense.