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animal crab red white spots background nature wildlife biology marine food seafood tropical exotic macro photography detail texture pattern color contrast sharpness focus depth of field lighting composition rule of thirds balance symmetry rhythm movement energy action drama tension suspense mystery intrigue danger fear horror disgust revulsion nausea vomiting sickness illness disease death decay decomposition putrefaction rotting spoiling mold fungus bacteria germs microbes parasites viruses toxins poisons venom allergens carcinogens teratogens mutagens