[SunkenCiv]

the rest of the Beringia keyword:

• New map of Beringia 'opens your imagination' to what landscape looked like 18,000 years ago [02/11/2019]
• Mastodons Disappeared From Ancient Beringia Before Humans Arrived [12/04/2014]
• Pause Is Seen in a Continent’s Peopling [03/13/2014]
• CU-led study says Bering Land Bridge a long-term refuge for early Americans [03/01/2014]
• When Did Humans Come to the Americas? [01/27/2013]
• Beringia: Humans Were Here [05/19/2008]
• Bye, Bye Beringia (8,000 Year Old Site In Florida) [08/11/2003]
• Ancient dung reveals a picture of the past [04/23/2003]

[Rebelbase]

Could have sworn that I read the article theorizing the big cats hunting humans created a migration bottleneck at the land bridge.

Maybe it was a link posted on a thread that led me there.

Anyway, I found it to be a plausible idea.