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Cuttlefish are weirder than that, the current theory is their W-shaped pupil causes chromatic aberration on the retina and they can use that to detect colour.

• devrandomguy 9y ago
  Wow! I wonder if we could we potentially infer color from black & white photos of celestial objects, by this technique? Maybe it could be combined with the adaptive optics that attempt to cancel stuff like this?
  • dekhn 9y ago
    you can already do similar things with filters, you don't need any exotic biology to do it.
    • devrandomguy 9y ago
      But filters block light, reducing the effectiveness of the telescope. Also, you need to set them up before the photos are taken. I am suggesting a way to process existing grayscale photos, where the operator may have decided that filters weren't worth diminishing the captured light, or the increase in communications bandwidth.
• dekhn 9y ago
  Hmm, I'm skeptical. Beyond meaning they'd need to be reclassified as color-vision with a unique mechanism (in itself interesting), it doesn't really address how the camouflage on the top of the squid matches what's below in (where its eyes can't see). BTW: a press release and Science paper is not "the current theory".