Can We Bring Back the Passenger Pigeon?
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The Rusty Blackbird has much the same problem, and the fear is that it may have now dropped below its threshold.
The same thing nearly happened to the bison; there were less than 300 individuals left in 1900, mostly preserved as private property by a few individuals who wanted to save them from extinction. The Yosemite herd was an exception, 23 individuals than managed to hide out in Yellowstone. https://en.wikipedia.org/wiki/Bison_hunting#Resurgence_of_th...
An interesting thought exercise is to presume this is written about the Homo Sapiens at some point in the distant future by a neutral 3rd party observer.
He mentioned that a few animals have been resurrected in a slightly different way already. Eg. the Red Factor Canary was resurrected by breeding a Domestic Canary and a Red Siskin. Apparently the offspring had enough geno/phenotypic resemblance to the original Red Factor Canary that this newly created lineage was given that original name.
The animal that resulted died of lung complications shortly after birth, but apparently veterinarians indicated that these complications were totally within the norm of ibex ontogeny, and probably not a failing of the underlying cell biology.
So, for just a few minutes, an extinct species was brought back to life.
Even today the idea of add new blood to the remaining (and very inbreed) populations of wild goats is often mission imposible blocked by hunter's lobbies.
One vendor on one of these bids (maybe Cisco? I can't recall) answered back that while they don't currently support carrier pigeon they are considering it for a future feature enhancement.
I'm all for chestnut restoration and the Buffalo Commons and bringing back woolly mammoths and Carolina parakeets and passenger pigeons, but these are heroic efforts that are a drop in the bucket.
So, then, whatever we choose to do—whether it is protecting species, ignoring them, or exterminating them—is, equally, letting nature run its course.
Knowing that, we could selectively breed and engineer new species to fill the critical niches of species as they go extinct, so that the long-term viability of our own species and our allied species are never threatened.
The trick is understanding the point of certain threatened species as they are on the brink of extinction. It's hard to know if that species ever had an essential function if it isn't doing it any more.
The "Passenger Pigeon" is a specific breed, and not just a generic term for a pigeon that will carry messages.