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Somebody has asked about whether giant tortoises can swim. Apparently
they float like corks:
"Giant tortoises are capable of oceanic crossings, riding the waves
like an inflatable raft, head up, patient, enduring days or even weeks
afloat." David Quammen, 1996, _The Song of the Dodo: Island
Biogeography in an Age of Extinctions, Scribner, pp. 121-23.
This is a secondary source, but it probably wouldn't be hard to track
down the primary literature.
Incidentally, I have plugged this book before. It is a fine read, and
will put lots of ideas relevant dinosaur biology into your head.
I can imagine an ankylosaur or other big dinosaur patiently enduring
such a trip.