As an individual over 4 years old you know your basic reptile orders. They aren't hard, it's the 4 basic reptiles that you've known ever since you were little. There's the snakes, the lizards, the turtles, and the crocodiles (crocodilians). If it's so simple, why would I even bring it up? What if I told you you've been lied to ever since you were little. Your 1st grade science teacher or your 2nd grade level reading book lied to you, because there are actually 5 basic orders of reptiles. There are the 4 that I mentioned, along with the trouble maker, the Tuataras. Believe it or not this lizard looking creature is its own order of reptile. It is as old as the dinosaurs and looks like a modern version of one. Strangely enough they have a third "eye" on top of their heads. It's not visible because it's covered up by scales and pigment, but its still functional, and it may be used to sense what time of day it is, or what season it is based on the light that gets to it. They are the only remaining member of the Sphenodontia order. The rest of the members died about 60 million years ago. Unlike their gigantic cousins, Tuataras are only about 2.5 pounds at the most. They live only on 32 isolated islands in New Zealand. They used to live all over New Zealand, but the introduction of rodents to New Zealand made it hard for the Tuataras to survive because the rodents ate their eggs, and competed for the same food the Tuataras need. The islands they live on don't have any rodents, and this helps the Tuataras to live and breed. Due to the fact that there is such a small region of small islands that these ancient dinosaurs live on, they have become a huge conversational priority. They are a direct link to the Sphendontia order and it'd be a shame to see a species as old and unique as the Tuatara go extinct. The saddest part is that many people won't ever know that an entire order of reptile went extinct, because no one  knows about them. Conservation measures are being taken however, and they likely won't completely go extinct. I mean they've stuck around for over 60 million years,  so surely another million will be a piece of cake.