They are not extinct.  They went over the caucus mountains and settled in Europe. The Scandinavian countries were settled by the tribe of Dan.  Sweden (dan) Den(dan)mark, England was settled by another tribe and early on were called Saxons.  They all have Family crests which have Israelite symbols on them.  So almost all of Europe was settled by the 10 tribes of Israel who God divorced.  They eventually settled in America so.... you could be one of them. This can be looked up and corroborated in the Antiquities of the Jews if I remember right.