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I got curious about this after reading a blog article on pigeons and face recognition. What colors does a pigeon see in other pigeons? I see pigeons with white, black, and grey bands and patches, sometimes with iridescence in the neck. The wikipedia entry for bird vision says they have pentachromatic vision. [more inside]
posted by bleary on Jul 15, 2011 - 6 answers

What would happen if you practiced focusing your vision in and out? Would you strain your eyes? [more inside]
posted by bleary on Nov 23, 2010 - 8 answers