Oogi

Oogi  was the name of one of the Sky Bison owned by Tenzin.

History
Oogi is the descendant of a group of Sky Bison found by Avatar Aang after the species was thought to be extinct. He may have been descended from Aang's own Sky Bison, Appa, but his lineage is not known.

Oogi was used by Tenzin and his family to travel to the Southern Water Tribe to meet his father's successor so that Tenzin could inform her that he would be unable to train her due to unrest in Republic City.