Why does everyone - well, most everyone - still cling to the theory that anything in the Americas had to have come over the loop and DOWN into North America?
There's still that old belief that hangs on due to the "Old Worlds" people not knowing that the "New World" existed - which it did all those millions of years that the Old one die = that everything in the New World had to have gotten here from the Old.
Who's to say that some things may well have gone up and over the Straight FROM the "New" world to the old?
Take, for example, the camel.
The camel originated in North America and once lived in the Yukon and Alaska - long before the 'ice bridge' =
But scientists and establishment archaeologists still start with the premise that everything had to have come FROM the Old World - which isn't any older than the New World...even against the evidence that not only was Clovis man here long before the Bering Straight bridge - but so were others, as far south as South America - at least a millennia before the Bering Straight bridge -
But, as we have witnessed, once a scientist - particularly archaeologists - have a well entrenched theory, they're like a dog with a bone - devil take the evidence staring them in the face.
Or populated S. America when it was connected to Africa. Rode over on the continent.
Unless the climate in N. Siberia and Alaska was very different than now, I can’t see some of these animals surviving the winters during a migration across the ‘land bridge’.