Killinger the Den Watcher at the D.E.H.T.A. Encampment in the Borean Tundra wants you to kill Nedar, Lord of Rhinos and his companion, "Lunchbox."
West of here, on the high bluffs above Lake Kum'uya, roams a despicable being known as Nedar. The self proclaimed "Lord of Rhinos" hunts the wastes for the injured or young - rhinos unable to defend themselves against Ned's cowardly attacks. To add insult to injury, Ned has raised a rhino of his own to become his mount and bodyguard.
It is a rare thing that D.E.H.T.A. would ever call for the death of an animal, but Ned's tainted rhino must be disposed of... Kill them both and return to me.