He read (or, more likely, saw) Jurassic Park and thought it would be a great idea:
[E]ven as Gingrich knocks best-selling author Michael Crichton for works that he calls “just standard alarmist environmentalism in which humans are forever messing up nature,” the one-time aspiring zookeeper wonders: “Why not aspire to build a real Jurassic Park? (It may not be at all impossible, you know.) Wouldn’t that be one of the most spectacular accomplishments of human history? What if we can bring back extinct species?”
The man is, as George Will put it, hubris distilled.