66 million years ago, the iconic nonavian dinosaurs abruptly went extinct, leaving a vast void in the world. This led to a strange time and a new frontier for many of the animals that were still standing, and this time was known as the Danian (Early Paleocene).

Thumbnail Art: Beth Zaiken

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Sources:
https://en.wikipedia.org/wiki/Danian
https://en.wikipedia.org/wiki/Paleocene
https://en.wikipedia.org/wiki/Categor...
https://www.britannica.com/science/Da...
https://www.britannica.com/science/Pa...

Music:
Dreams Become Real by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/...

Source: http://incompetech.com/music/royalty...

Artist: http://incompetech.com/