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Yes, I mostly shared it because of the passenger pigeon stuff. The collapse of the passenger pigeon has really fascinated me ever since I first learned of it. 30 years. 5 billion animals to zero. That's a murder rate of almost unimaginable proportion. Half a million birds per day, on average. It doesn't even make sense. I'm a bit of a pessimist about species revival, because there's a lot more to a species than it's DNA (many other biomolecules, "culture", etc.). What we might achieve is some kind of hybrid, frankenstein animal, which isn't the thing itself. I don't really know if I agree with the wisdom of these projects, although I would be first in line to see a mammoth in person.