Watched this PBS show on roos last week. Very interesting, but definitely different to hear roo used like this. I'm used to thinking about crowing or other roo-like behavior when I hear the word, lol.
http://www.pbs.org/wnet/nature/episodes/kangaroo-mob/full-episode/7443/
http://www.pbs.org/wnet/nature/episodes/kangaroo-mob/full-episode/7443/