Owlbear
From Ardrana
Owlbears are probably the crossbred creation of a demented wizard; given the lethality of this creation, it is quite likely that the wizard who created them is no longer alive. Owlbears are vicious, ravenous, aggressive, and evil tempered at all times.
Owlbears are a cross between a giant owl and a bear. They are covered with a thick coat of feathers and fur, brown-black to yellow-brown in color. The 8-foot-tall males, which weigh between 1,300 and 1,500 pounds, are darker colored. The beaks of these creatures are yellow to ivory and their terrifying eyes are red-rimmed. Owlbears speak their own language, which consists of very loud screeches of varying length and pitch.
Arctic owlbear
Arctic owlbears are the polar cousins of the normal owlbear. They resemble a cross between a snowy owl and a polar bear. Both their fur and their feathers are a snowy white, while the claws and beak are both black. Yellow, glowing eyes look forward from a rounded head. Like other owlbears, arctic owlbears communicate with hoots and loud screeches.
Note: Owlbears originally appeared in this form in the 2nd Edition Monstrous Manual for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.