However , these migrations were mostly limited to large , cold - tolerant species ( Rodriguez et al. 2006 ) .
This is the result of several faunal interchanges that took place across the Bering land bridge .
These migrations were mostly limited to large , cold - tolerant species ( Rodriguez et al. 2006 ) .
This is the result of several faunal interchanges that took place across the Bering land bridge .