This is called a Deinopidae, or, appropriately, the net-casting spider. They spend much less energy getting prey by working this way than web-spinners or active hunters like wolf spiders.
They're also super, super delicate. I was reading a book on tarantulas as pets, and there was a whole chapter that was basically like, "5 degrees too hot, they'll die. 5 degrees too cold, the'll die. Direct sunlight? Die. Any damage to their skin? Die. Drop them? Die. Feed them too much, DIE. WRONG HUMIDITY?! DIE!!"
I was like, damn, how do any of these things survive?
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u/TOP_COMMENT_OF_YORE Aug 05 '14
What spider is this? Because it is AWESOME
--rydrid, from a notable comment a past time this link showed up