Kangaroo-related motor vehicle collisions

Background Motor vehicle collisions that are caused by large animals affect motorists in most parts of the world and tend to be increasing in incidence. Although traffic accidents involving kangaroos are common in Australia, we are not aware of any series that reported human injuries caused by such accidents. We aimed to study the mechanism, type, and outcome of these injuries. Methods Forty-six patients (32 male and 14 female patients; median age, 31.5 years) who presented to Royal Perth Hosupital and who had been involved in a motor vehicle collision that was related to kangaroos between July 1994 and June 2000 were studied. Results The patients had a median Injury Severity Score of 9 (range, 1-41); 67.4% were car collisions and 32.6% were motorbike collisions, 41.3% had direct collision with a kangaroo, 34.8% hit a secondary object, and 32.6% rolled over. Most of these injuries affected the head and face (54.3%), upper extremities (57.4%), and lower extremities (40.4%). Only four had intracranial injuries (8.7%). Ninety percent of these collisions occurred at night, 74% in the countryside and 85% on highways or streets. The incidence was reduced during winter. Only one patient in this series died (2.2%). Conclusion Most kangaroo-related motor vehicle collisions occurred at night, in the countryside, and on highways when the driver tried to avoid a kangaroo. Although injuries resulting from these collisions are relatively mild, increased awareness of their presence and ways to reduce them have to be promoted.