Actually all three have a 'bad' side. If you watch the Emu's legs it kicks really high and fast. It has a middle toe like a dagger and can actually disembowel you in an instant. As can the Kangaroo and the Casowary, they all
out to fight...
The guy in the video with the Roo (kangaroo) had something like 30 stitches in his groin. Nice lil Roo.....
Mostly they are quite friendly and sociable... and thats the problem.. lil kids go up to pat them and whack...