Oceanic dispersal is a wild idea. Some animals can swim from where they are to an entirely different place. Even among those that can't, some have been relocated via vegetation rafts.
Rafting doesn't guarantee safe arrival, of course. In some cases creatures may simply find themselves floating out into the ocean with no way to survive. This is sad, although the sadness is somewhat abstract, there not actually being anyone to mourn.
But then there are successes. New World monkeys, for one. Simians that made the long journey from Africa to South America. They actually got a chance to start a new life, and it was a gain for all.
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That was a most informative article about species traveling from one continent to another on rafts made up, often enough, of floating storm debris. There are definitely more than I would have guessed including the New World monkeys.
The next wave of animal migration came from people deliberately carrying creatures on boats either as pets or foodstuffs. Rabbits didn't get to Australia on their own and neither did cane toads.
https://www.bbc.com/news/world-australia-39348313
Nowadays modern transport has taken a turn in helping creatures travel to new shores - usually by accident and consequently destructive.
But the part I really want to draw your attention to is the theory that people thousands of years ago made their own rafts so they could move from one place to another. Thor Heyerdahl was a major proponent of human migration by raft and he built and sailed the Kon Tiki to prove his belief. The following article and video show his results:
https://runawayjuno.com/runaway-tales/thor-heyerdahls-kon-tiki-expedition-across-the-pacific-by-raft/
Kon Tiki - Thor Heyerdahl - the Academy Award winning documentary from 1950
https://youtu.be/gvBYfba8nv8?si=EdeuRCiT3IaUKC95
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