Pliocene Park

People who saw Jurassic Park, and are convinced that they are smart enough to do it right:

And it's not just mammoths. Revive and Restore, a nonprofit organization advocating "de-extinction," has identified 24 candidate species that could potentially be brought back. In other words, a menagerie of extinct species, like the one from Jurassic Park, is in reach.

To be a candidate for resurrection, one needs adequate samples of DNA, and there must be a living species that is closely related enough to act as a potential surrogate parent. This rules out dinosaurs for the time being (in case you were wondering), but available candidates include passenger pigeons, dodo birds, Irish Elk (a giant deer from the ice age that had antlers 12 feet across) and even the saber-toothed tiger. (Perhaps Pliocene Park, not Jurassic Park, would thus be the more accurate title for a preserve of extinct species, even if it's not as evocative.)

Oh yes, saber-toothed tigers.  You think your house cat is ferocious?   You think mountain lions are dangerous?