It looks like it is trying too threat.
http://www.frontiersin.org/files/Articles/894/fnbeh-03-050/image_n/fnbeh-03-050-g001.gif
Source:
It looks like it is trying too threat.
http://www.frontiersin.org/files/Articles/894/fnbeh-03-050/image_n/fnbeh-03-050-g001.gif
Source: