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Ten Things I Like About... PodcastAuthor: Kiersten Gibizov
This is a 10 minute, 10 episode podcast about unknown or misunderstood wildlife. Language: en Genres: Kids & Family, Nature, Pets & Animals, Science Contact email: Get it Feed URL: Get it iTunes ID: Get it |
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Tuatara: Lizard or Not a Lizard?
Episode 141
Wednesday, 21 January, 2026
Summary: Is the tuatara a lizard? We have hinted at it for a few episodes. Join Kiersten to find out if the tuatara is or is not a lizard. For my hearing impaired followers, a complete transcript of this podcast follows the show notes on Podbean Show Notes: “It’s not a lizard or a dinosaur: the tuatara is something else entirely,” by Bec Crew. Australian Geographic, https://www.australiangeographic.com.au “New study shows modern tuatara are little changed from 190 million year old ancestors.” Harvard University Department of Organismic and Evolutionary Biology. https://www.oeb.harvard.edu Parietal Eye, https://www.sciencedirect.com/topics/veterinary-science-and-veterinary-medicine/parietal-eye Music written and performed by Katherine Camp Transcript (Piano music plays) Kiersten - This is Ten Things I Like About…a ten minute, ten episode podcast about unknown or misunderstood wildlife. (Piano music stops) Kiersten - Welcome to Ten Things I Like About… This is a podcast about misunderstood or unknown creatures in nature. Some we’ll find right out side our doors and some are continents away but all are fascinating. This podcast will focus ten, ten minute episodes on different animals and their amazing characteristics. Please join me on this extraordinary journey, you won’t regret it. During the last few episodes of tuatara, I have asked the question of whether the tuatara is a lizard or not a lizard. Today we are going to answer that question. The fifth thing I like about the tuatara is the unusual quirks that make them a unique reptile. We have established that the tuatara is in an order of reptiles all by itself, Order Rhynchocephalia. This means that they have no living relatives. That in itself doesn’t mean they are not lizards, it just means they are not related to any living lizards. So let’s look at a few more attributes of the tuatara that will help us answer our question. In the last episode we discussed the third eye, or parietal eye of the tuatara. Now other species of reptiles, mainly lizards, have a third eye as well. Certain iguanas, skinks, and monitors have a parietal eye, but their third eye is primitive and is not visibly seen at any stage of their development. The basics of the eye are there but it is hidden under a scale. The tuatara’s eye is much more developed and is exposed in young hatchlings. For more in depth discussion of the tuatara’s this eye, please listen to the previous episode. There are several things about the tuatara’s skeleton that also sets it apart from lizards. One is the teeth. The tuatara has three rows of teeth. One row in the lower jaw and two in the upper jaw. When the tuatara bits down the lower teeth fit into the groove between the two rows of upper teeth. That is very unusual and as far as we currently know, no other reptile has a tooth formation like this. The teeth are fused to the jaw and have no roots, which is unlike most lizard teeth. Tuatara teeth are not replaced during their lifetime and as they age and their teeth wear down, they have to switch to softer prey. Another strange and interesting thing about the tuatara’s jaw is that when it eats the jaw doesn’t open and close in the typical chewing motion of most animals. It moves forwards and backwards slicing their prey like a saw. Locals of the islands where tuatara live always know when the reptiles have been hunting because they find birds with their heads sawed off. Another unique attribute of the tuatara skull is the complete lower temporal bar that closes the lower temporal fenestra. The temporal fenestra is the opening in the skull behind the eye socket. Most modern lizards do not have a complete temporal bar. Researchers believe the complete bar in the tuatara is used to stabilize the skull during biting. It’s a unique jaw motion and it makes sense that the skull needs a bit more support. As we travel down the skeleton of the tuatara we see some more unique features. The spine is made up of hourglass shaped vertebrae. This shape can be found in fish and amphibians but is unique reptiles to the tuatara. Each vertebrae has a tiny hole through which a rennet of the notochord passes. This was typical in early fossil reptiles but not in modern ones. Could there be more unique features of this amazing reptile? Yes. We are not done with the odd features of the tuatara. Their ribs have some unique features as well. They have extra ribs, or rib-like bones, called gastralia that are not attached to the ribcage. These are also found in a few lizards and crocodiles. The tuatara have unicate processes on the actual ribs that are indicative of birds, and are found in modern bird skeletons, but are found only in the tuatara in the reptilians. The pelvis and shoulder girdles of tuatara are also completely different from lizards. Tuatara have a different rotational angle that allows them to push their body up off of the ground to move, should they choose to, where as lizards have a more sprawling motion when they walk. Tuatara don’t often hold themselves up to walk as it is tiring. Tuatara are also equipped for a cooler habitat than lizards. They have a unique hemoglobin structure that allows them to survive very cold temperatures. One last unique attribute of tuatara that I will mention in this episode is how long they live. Tuatara can live up to one hundred years! That is definitely longer than any lizard we know of today. So knowing about all these different and unique attributes of the tuatara, we come back to the question of whether they are lizards or not lizards. Science says, no they are not lizards and those that study the tuatara are definitely offended when they are called lizards. If anyone ever asks or incorrectly refers to the tuatara as a lizard, you can now politely inform them that they are incorrect. Tuatara are not lizards, reptiles yes, lizards no. My fifth favorite thing about the tuatara is that they are truly not lizards. If you're enjoying this podcast please recommend me to friends and family and take a moment to give me a rating on whatever platform your listening. It will help me reach more listeners and give the animals I talk about an even better chance at change. Join me next week for another exciting episode about the tuatara. (Piano Music plays) This has been an episode of Ten Things I like About with Kiersten and Company. Original music written and performed by Katherine Camp, piano extraordinaire.
