Some species of Kangaroo can grow to a height of 8 ft, have been known to disembowal people with their 2 knife like toe nails. One important thing with the males of this species, they will try to copulate with female humans menstruating, which appears to be happening here in this photo.

http://www.wombatrise.com/wgk.htm

http://www.youtube.com/watch?v=lUqOUGlqsc8&feature=related