Otodus megalodon is the largest shark known to science, yet we have never found a complete skeleton. Almost everything we know comes from teeth, a few vertebrae and some clever detective work.
Why only teeth?
Shark skeletons are made of cartilage, not bone, and cartilage rarely fossilizes. Teeth are a different story: they are hard, sharks shed thousands of them over a lifetime, and they survive for millions of years. Megalodon teeth are found on every continent except Antarctica, and large ones can measure more than 15 centimeters along the edge.
So how big was it?
To estimate body size, scientists compare megalodon's teeth and vertebrae with those of living sharks and scale up. Because the method depends on which living shark you use as a model, the answers vary. Most estimates place the largest individuals at roughly 15 to 20 meters long, around three times the length of a great white shark.
Recent research has also questioned its body shape. Older reconstructions treated megalodon as a giant great white, but some newer studies suggest a longer, slimmer body, which would change both the length and weight estimates. This is an active debate, so be wary of any single "exact" number.
When and how did it live?
- Time: from about 23 million to about 3.6 million years ago (Miocene to Pliocene).
- Range: warm and temperate oceans worldwide.
- Prey: bite marks on fossil bones show it fed on marine mammals, including whales.
- Nurseries: sites with many small teeth suggest young megalodons grew up in sheltered coastal waters.
- Body temperature: chemical studies of its teeth suggest megalodon kept its body warmer than the surrounding water, like some living sharks do.
Why did megalodon disappear?
There is no single agreed answer. Leading ideas include a cooling ocean, changes in the whales it hunted, and competition from other predators, possibly including early great white sharks. And no, it is not hiding in the deep sea: a giant warm-bodied shark that sheds teeth constantly would leave plenty of modern evidence.
Bring the giant home
Our Megalodon Open Ocean tee (Plate 150) shows the shark hunting in a Miocene sea, and the Megalodon Tooth Specimen tee (Plate 173) celebrates the fossil that started it all.