How is the brown tree snake believed to have first arrived on the island of Guam?
Answer
It hitched a ride in military cargo after World War II.
The snake likely arrived on Guam by stowing away in military cargo following the conclusion of World War II.

Related Questions
Where did the brown tree snake primarily originate before arriving on Guam?How is the brown tree snake believed to have first arrived on the island of Guam?What proportion of Guam's native forest bird species has been eliminated due to this snake invasion?What critical ecological role performed by the native birds collapsed following their eradication?Which trait made the brown tree snake particularly well-suited to prey upon Guam's native birds?What does the term 'extirpated' signify regarding the native birds of Guam?What measurable alteration in the forest structure is attributed to the loss of native birds?What observation suggests the snake possesses an extreme feeding drive in its new environment?What is noted as the primary vector for the potential global spread of the brown tree snake from Guam?What lesson does the devastation on Guam emphasize regarding management strategies for this invasive species?