"Venomous Theft: The Deadly Sea Slug's Lethal Strategy"

TL;DR
The blue dragon, a tiny sea slug found in tropical and subtropical waters, has a striking appearance and a unique lifestyle. It feeds on venomous creatures such as Portuguese men o'war and stores their stinging cells for self-defense. Its ability to release these cells all at once makes it dangerous to swimmers and beachgoers. Additionally, as hermaphrodites, they have both male and female reproductive organs and lay strings of eggs that hatch in a few days.
The deadly sea slug that steals venom from its prey Livescience.com
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