New studies suggest that hitch-hiking is an activity that daring members of the animal kingdom engage in. And it may lead to serious ecological problems.
Dr David Chapple, Dr Bob Wong and Sarah Simmonds, School of Biological Sciences, Monash University
Trends in Ecology and Evolution and Ecology and Evolution, http://www.monash.edu.au/news/show/dont-panic-the-animals-guide-to-hitchhiking