For every species of animal on Earth today, there are many more that have not been seen for millions of years.
Imagine the very spot where you are standing, 400 million years in the past: you would be surrounded creatures, the likes of which you've never seen before! But why do the animals we know today look so different? Take a breathtaking look back in time at all of the wondrous and bizarre species that roamed the planet long before the first humans drew breath, and learn how they fought for their survival... or how they became extinct!
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