When you realize your home’s look hasn’t evolved much since its post-college phase, you put the Ikea bookshelves on Craigslist, start searching for a contractor who won’t drive you crazy, scrutinize endless tile samples and stop considering Pottery Barn too public a venue to fight with your spouse. Then you prepare the neighbors and pay the county. When you realize your reptile house is “stuck in the ’80s,” as National Zoo biologist Matt Evans did last year, you put your aging non-endangered snakes, turtles and lizards on the Association of Zoos and Aquariums’ “status list” (a Freecycle of sorts for curators), work the phones to find a new home for unwanted animals, and start cashing in favors from former colleagues whose zoos have just the gecko you gotta have.