Slide 1
Cuttlefish skin changes patterns rapidly
A cuttlefish can rapidly alter its skin pattern. Pigment organs and light-reflecting structures contribute to the animal's changing appearance.
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Camouflage depends on the observer and surroundings. Matching brightness, pattern or texture can reduce detection without reproducing every colour and detail like a literal photograph.
Slide 2
Muscles spread pigment organs called chromatophores
Muscles can spread pigment-containing organs called chromatophores. Changing their visible area helps create darker and lighter patterns across the skin.
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The nervous system controls these changes in coordinated groups. A pattern is an active display produced by many small structures working together, rather than pigment slowly drifting around the body.
Slide 3
Reflective structures add colour and brightness
Reflective structures contribute colours and brightness alongside pigments. Cuttlefish skin combines more than one way of controlling returning light.
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Pigment absorbs selected light while reflection changes how light is sent outward. Combining optical mechanisms expands the appearances possible without needing a separate pigment for every visible effect.
Slide 4
Muscular papillae turn smooth skin into a textured surface
Cuttlefish can raise small muscular structures called papillae. A smooth surface becomes textured, helping the animal resemble parts of its surroundings.
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Texture affects the outline and shadows that a predator sees. Matching colour alone may leave a conspicuous smooth body, so three-dimensional changes provide another component of concealment.
Slide 5
The same skin can conceal the animal or send a signal
Cuttlefish change appearance in social encounters as well as concealment. A conspicuous signal and an inconspicuous pattern can use the same skin.
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Context is necessary when interpreting a display. A vivid pattern does not automatically indicate camouflage failure; the animal may be communicating rather than trying to disappear from every observer.
Sources
- How the Cuttlefish Spikes Out its Skin
Marine Biological Laboratory
- New Reflective Mechanism in Cuttlefish Skin
Marine Biological Laboratory