Chickensaurs, mammoths, neanderthals, how far will it go?

Woolly mammoths are arctic-zone animals: large, shaggy, and with a generous band of fat, all for the purpose of conserving body heat in a climate so cold it has permanent ice. As the earth rises out of its ice age and the arctic zone disappears, it's doubtful that we'll be able to keep the polar bear population alive, except in refrigerated captivity for survival of the gene pool.

The temperature was already too warm for woolly mammoths many thousands of years ago, so it's certainly too warm for them now. They too would have to be kept in refrigerated enclosures. But they're so much larger than polar bears, and require even colder temperatures, that this would be enormously expensive.

Polar bears are already here and lots of people love them, even though most of them have never actually seen one. Even with that advantage scientists and zookeepers are having great difficulty establishing habitats for them.

But to resurrect an extinct animal and spend a fortune to keep a breeding population alive at much greater expense than the polar bears? Who's going to fund that project?

It's generally assumed that Neanderthals were very similar to sapiens, even to the point of having a speech center in their brain that allowed them to invent and use language. After all, the evidence is incontrovertible that they interbred with our species.

So when you finally are successful at cloning one of them, what exactly are you going to do with him? He's a human being. Gonna put him out for adoption and let a suburban family raise him and discover his differences the hard way? Or are you going to imprison him in a laboratory setting like a chimpanzee who can sign in ASL, violating his human rights?