![](http://static.ddmcdn.com/gif/recipes/spider-dna-151130-200.jpg)
Knowing which species of spider built a web in a certain
area, as well as what it feasted on, are important pieces of information
for researchers.
![](http://static.ddmcdn.com/gif/recipes/blue-tarantulas-151130-200.jpg)
Researchers marvel at the evolutionary convergence, even as they're not sure what purpose the color serves.
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