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52 of the Most Colorful Snails in the World - Color Meanings
Tyrian purple - Wikipedia
Sea snail - Wikipedia
Sea Snail: The Marine Gastropods - Ocean Info
Amazing Sea Snail Facts - American Oceans
5 Sensational Sea Snail Species - Ocean Conservancy
Mystery Snail Colors • Shell, Body, & Stripes (+ Pictures)
What Color Is A Snail Itself & Snail’s Shell? & Tail?
In Ancient Rome, Purple Dye Was Made from Snails
Tyrian Purple: The disgusting origins of the colour purple - BBC