Baby tuatara, a rare reptile, found on New Zealand mainland

Oh, baby.

The discovery of a one-month-old tuatara, a rare reptile descended from lizard-like dinosaurs, has conservationists in New Zealand celebrating. The critter is the first baby tuatara to be spotted on the mainland there in two centuries, since zoologists released 200 adults inside the Kaori Wildlife Sanctuary beginning four years ago in the hope they'd reproduce.

"We are all absolutely thrilled with this discovery," the sanctuary’s conservation manager, Raewyn Empson, said in a statement. "It means we have successfully re-established a breeding population back on the mainland, which is a massive breakthrough for New Zealand conservation."