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Octopuses communicate through a variety of means from "summary" of The Soul of an Octopus by Sy Montgomery

Octopuses communicate through a variety of means. They can change color and texture to convey emotions and intentions. Color changing is a primary mode of communication for octopuses. Their skin contains cells called chromatophores, which contain pigment and can expand or contract to change color. By altering the size of these cells, octopuses can produce a wide range of colors and patterns. They can blend in with their surroundings, camouflage themselves, or display vibrant hues to signal their mood. In addition to changing color, octopuses can also alter their skin texture. They can raise bumps, ridges, and spikes on their skin to communicate aggression or submission. By changing the texture of their skin, octopuses can intimidate rivals or attract mates. This tactile form of co...
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    The Soul of an Octopus

    Sy Montgomery

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