Even outside of Dungeons & Dragons, Gary Gygax liked owlbears. Behold a couple of pages from the second volume of his 80's gamebook series Sagard the Barbarian:
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I disapprove of their 'cooler' nightripper name, though. Their inherent absurdity is surely the greatest part of the creatures' charm. Artist Les Morrill's depiction of them as a four-footed predator is pretty sweet, though.
The adventures in the books take place on planet Oerth as well...