Los Angeles Pleistocene

I propose that animals and plants related to, or possibly cloned or genetically engineered to closely resemble, Pleistocene and Ice Age lifeforms should be reintroduced into the Los Angeles Basin. And if you're wondering "wait, wouldn't that mean the creatures walking among us?", well, probably, maybe at first they live on what were the county's numerous golf courses, maybe some set-up corridors and tunnels in case humans are concerned about anything.