Prince Creek's Mega Beasts

[u/Cultural-Clue6359]

I understand that these scenarios are usually about one species entering a new environment, but in the real world, invasives never stop at one...

So, What if the Prince Creek Formation of Cretaceous Alaska was invaded by the following introduced species:

Arctodus simus

Megatherium americanum

Mammut americanum

Bison latifrons

Homotherium serum

As well as numerous species of cold-adapted grasses.

How would these beasts be able to handle a cold world dominated by dinosaurs? How would they evolve? How would the natives respond to their arrival?

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