Dicerorhinus:
*How much do you think exporting a new batch of rhinos to ex-situ facilities would cost? I'm pretty sure that it would be in the millions when you factor in the need to build special holding facilities for them and the care to maintain them. So no, I am not exaggerating the cost of establishing a sustainable ex-situ rhino population. I think that you have no idea of what this magnitude of project costs when you factor in running and maintaining the project in perpetuity.
*You have great faith in the ability of reproductive science and technology to be able to produce a sustainable ex-situ population of Sumatran rhinos. Empirically, this technology has not worked in over 2 decades of attempts to produce a sustainable ex-situ population. You are always hand-waving that the project was hampered by the selection of "expendable" post-reproductive individuals as the founding stock. No doubt there is truth in that, but at the time the Sumatran rhinos were captured to establish the ex-situ population there were field biologists arguing that viable wild individuals were being captured too.
Our fundamental disagreement I think is that I do not share your faith that the reproductive science will work and a sustainable population of Sumatran rhinos can be produced.
With the confirmation that there are Sumatran rhinos left in Borneo and that there is still a core habitat for them in Sumatra, my opinion is that the many millions of dollars that would be needed for another attempt to establish a sustainable ex-situ population would be best spent supporting in-situ conservation. If reproductive science can help augment that then I'm all for it, but it seems to me that the ethical thing to do is to build in-situ facilities (or augment what already exists) rather than trying to slog the rhinos to Ohio or wherever.
Our disagreement I think is not about science, but about what the most practical and ethical path forward for Sumatran rhino conservation is. In the end the people who "own" the rhinos are the ones who get to make the decision so I'm under no illusions that my opinion has much meaning other than as someone who wants these rhinos to be around for the rest of the 21st century and beyond. I know that you want that too and have a different opinion of what the best course of action is.