>>16485646
>How do islands get bugs?

Air currents actually do most of the work.
The sky has wind tunnels, channels, whatever word you want to use, that flying insects (and spiders with web parachutes) use to glide to new territories like islands. Beyond that this Anon has you covered: >>16485794 on birds, and on drift wood or flotsam (insects can go without sustenance for a long time).

People also accidentally introduce insects via ship, but more specifically on produce like fruits and vegetables. Soil is another potential contaminating agent: coconut rhinoceros beetles were infamously introduced to Hawaii, subsequently ruining the many of the state's coconut trees, via grubs in garden soil originally packaged and imported from South East Asia.

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How do islands get bugs?