PictariaPictaria

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Varicose Wart Slug

Ocean Aquaria

A glimpse inside

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Varicose Wart Slug

A pastry with a blue hem

Sea slugs like the varicose wart slug are snails that gave up the shell somewhere back in evolutionary time and traded armor for chemistry. It moves at a pace measured in inches per hour, and the blue-black frill along its edge is a signal to any fish considering a bite.