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Cuttlefish belong to the cephalopod group and are considered among the most intelligent invertebrates. In addition to their intelligence, they are known for their sophisticated visual communication, which involves changes in skin color, texture, body position, and movement. By combining these elements, cuttlefish can convey dozens of distinct signals or "words." The mantle fin is typically used for swimming. As predators, cuttlefish approach their prey slowly before extending two long tentacles to capture it. Their salivary glands are often adapted into poison glands, which they use to paralyze their prey. The well-known cuttlebone, a calcareous structure, is a subcutaneous remnant of their ancestral shell.
