Snapzu Earth & Nature
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Secret codes and hidden messages aren’t just for computer security experts or kids passing notes in class — animals use them too. The telltale red hourglass of the black widow spider sends a warning signal that some animals can see but others cannot, finds a Duke University study.
Continue reading at: http://snapzu.com/Dino55/black-widows-obvious-to-predators-stealthy-to-prey
