what is the first one?
A shrub-ox that is an extinct genus and species of ovibovine caprine native to North America
Euceratherium
The shrub-ox (Euceratherium collinum) is an extinct genus and species of ovibovine caprine native to North America along with "Bootherium" ("Bootherium bombifrons") and Soergel's ox ("Soergelia mayfieldi").
where did the polar bear live with her family In the Arctic Circle, encompassing the Arctic Ocean what do they eat? ringed and bearded seals are they very strict about their diet? No. in what way? They consume a wide variety of other wild foods, including muskox birds, eggs, rodents, crabs, other crustaceans and other polar bears. did these birds exist since prehistoric days? UNANSWERABLE does the first animal has any links to prehistoric period? Yes, during the Pleistocene period, muskoxen were much more widespread. what are the names of their extinct relatives? "Euceratherium",  "Soergelia",  "Praeovibos", etc.
wiki:22861101
Euceratherium [SEP] Introduction
The shrub-ox (Euceratherium collinum) is an extinct genus and species of ovibovine caprine native to North America along with "Bootherium" ("Bootherium bombifrons") and Soergel's ox ("Soergelia mayfieldi").