For 35,000,000 yrs ground sloths went from South America to Alaska, etc, then went extinct after humans came because the weather

Thalassocnus natans, marine going ground sloth.

https://pbs.twimg.com/media/FcdWYeJXwAA4Owc?format=jpg&name=large

https://pbs.twimg.com/media/FcdWYeJXwAA4Owc?format=jpg&name=large

Here's some good info about giant ground that sloths lived in southern California until around 13,000 years ago from the San Diego Natural History Museum which fits much of the rest:

https://www.sdnhm.org/exhibitions/fossil-mysteries/fossil-field-guide-a-z/giant-sloth/