Prehistoric animals that still roam the Earth  

Sturgeon have been around for 100 million years and can be found in both fresh and salt water.

Scientists are interested in tuatara because they help us figure out how snakes and lizards evolved.

The Coelacanth, thought to have gone extinct millions of years ago, was rediscovered by scientists in 1938.

Of course, some animal species live on for a lot longer than a few million years before they go extinct. These are called living remains. There are animals here that have been around for a very long time. Let's look into some of the oldest animals from ancient times that are still alive today.

Sturgeon have been around for 100 million years and can be found in both fresh and salt water. In the colder parts of the Northern Hemisphere, there are more than 25 different kinds.

Some species are in danger of going extinct because they are used to get some of the best caviar in the world. Lampreys eat them for their blood, even though they are pretty safe because they are so big. The biggest sturgeons weigh over a thousand pounds.

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