Diego Pol says that all dakosaurs became extinct by the end of the Cretaceous era 65 million years ago, leaving us with only a fraction of the crocodile diversity of that long ago time.
"This pattern of extinctions is what we see in the fossil record of all species. It is fairly common to see that a species or family has its own moment where it diversifies and later goes extinct. The most famous case of this is the large dinosaurs that disappeared by the end of the Cretaceous," he said.
You might call these ferocious meat-eating dakosaurs, the dinosaurs of the sea, animals that shared the world at the same time.
Although they are no longer around, their smaller crocodile descendants, who split their time between land and water, are no friendlier and might just as well be avoided.