![](http://static.ddmcdn.com/gif/recipes/weird-mollusk-has-151120-200.jpg)
The animal has a shell made of overlapping plates, allowing
it to roll up in defense if a predator pries it from the tidal-zone rock
it calls home.
![](http://static.ddmcdn.com/gif/recipes/lookout-fish-151119-200.jpg)
Scientists work out an enduring mystery about how some fish can seem to disappear.
![](http://static.ddmcdn.com/gif/recipes/smeagol-spider-151119-200.jpg)
The new arachnid was discovered in its underground lair, a limestone cave.
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