<P> International Left - Handers Day is held annually every August 13 . It was founded by the Left - Handers Club in 1992, with the club itself having been founded in 1990 . International Left - Handers Day is, according to the club, "an annual event when left - handers everywhere can celebrate their sinistrality (left - handedness) and increase public awareness of the advantages and disadvantages of being left - handed ." It celebrates their uniqueness and differences, who are from seven to ten percent of the world's population . Thousands of left - handed people in today's society have to adapt to use right - handed tools and objects . Again according to the club, "in the U.K. alone there were over 20 regional events to mark the day in 2001 - including left - v - right sports matches, a left - handed tea party, pubs using left - handed corkscrews where patrons drank and played pub games with the left hand only, and nationwide' Lefty Zones' where left - handers' creativity, adaptability and sporting prowess were celebrated, whilst right - handers were encouraged to try out everyday left - handed objects to see just how awkward it can feel using the wrong equipment!" </P> <P> Kangaroos and other macropod marsupials have a left - hand preference for everyday tasks in the wild .' True' handedness is unexpected in marsupials because, unlike placental mammals, they lack a corpus callosum . Left - handedness was particularly apparent in the red kangaroo (Macropus rufus) and the eastern gray kangaroo (Macropus giganteus). Red - necked (Bennett's) wallabies (Macropus rufogriseus) preferentially use their left hand for behaviours that involve fine manipulation, but the right for behaviours that require more physical strength . There was less evidence for handedness in arboreal species . Studies of dogs, horses, and domestic cats have shown that females of those species tend to be right - handed, while males are lefties . </P>

Who is most likely to be left handed