In line with Department of Agriculture, Fisheries and Forestry protocols, every cabomba weevil was inspected for hitchhikers in the form of parasites or pathogens before leaving quarantine.

Source: https://phys.org/news/2023-03-biocontrol-solution-sustainable-aquatic-weed.html

There has been an increase in the number of student hitchhikers on the road as public transportation costs have increased, Yeniduzen reports.

Source: https://lgcnews.com/public-transport-fares-increased-by-40-percent/

Varieties that are new to an area also can carry dangerous “hitchhikers.”

Source: https://grist.org/agriculture/the-kelp-business-is-booming-can-regulators-keep-up/