Tuatara
Weirdness 9/10

The dinosaur-age reptile with a real third eye on its head

This reptile has a hidden third eye on top of its head and predates the dinosaurs' relatives.

📋 Fact File
🐾 Reptile🍽️ Carnivore
📏 Size
Males up to about 50 cm (20 in) long; females smaller
About as long as your arm
Lifespan
Up to about 100 years
🟢 Least ConcernSafe for now — but only in predator-free refuges: rat-free islands and fenced mainland sanctuaries, after rats wiped it off the open New Zealand mainland.
🤔 Guess first

Which one is REALLY true about the Tuatara?

The short version

The tuatara of New Zealand looks like a lizard but is the last survivor of its own ancient order, with ancestors from 200+ million years ago. It has a real 'third eye' on top of its skull, with a lens and retina, sensitive to light. It lives impossibly slowly — holding its breath ~an hour, growing for decades, and living past 100.

Why it's so weird

  • The Tuatara has a real third eye on top of its skull, complete with a lens and a retina that senses light.
  • The Tuatara looks like a lizard but belongs to its own ancient group with no close living relatives.
  • The Tuatara comes from a line of reptiles that walked the Earth over two hundred million years ago, making it a true living fossil.
  • The Tuatara can hold its breath for around an hour.
  • The Tuatara keeps growing for decades and can live well past a hundred years old.
📏 How big is it, really?
Tuatara
50 cm
Tuatara
a 7-year-old
1.2 m
🧒

You could line up about 2 of them along a 7-year-old!