The history of the Earth spans about 4.5 billion years, during which countless creatures have appeared and gone extinct thanks to evolution. The only evidence we have that they existed is their remains, such as bones, teeth, and footprints, among other things. Many of them are shared on the ‘Nature Was Metal’ community, where curious minds gather to get a look at how different our planet was long before humans came into existence.

We can bet our dear Pandas are curious too, so we compiled a list of the most fascinating photos and illustrations of creatures that became extinct millions of years ago. Scroll down to check them out for yourself, and don’t forget to upvote the ones you can’t believe are real.

While you're at it, make sure to check out a conversation with Dr. Jingmai O'Connor,

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