Animal behaviour: spiders that simulate to be other spider's prey, to...

Animal behaviuour: spiders that simulate to be other spider's prey, to... eat them.

http://es.wikipedia.org/wiki/Portia

http://en.wikipedia.org/wiki/Portia_%28genus%29

Portias look like leaf detritus caught in a web, and this is often enough to fool web-building spiders, which have poor eyesight.