An owlbear?s coat ranges in color from brown-black to yellowish brown; its beak is a dull ivory color. A full-grown male can stand as tall as 8 feet and weigh up to 1,500 pounds. Adventurers who have survived encounters with the creature often speak of the bestial madness they glimpsed in its red-rimmed eyes.

Owlbears attack prey?any creature bigger than a mouse?on sight, always fighting to the death. They slash with claws and beak, trying to grab their prey and rip it apart.
Improved Grab (Ex): To use this ability, an owlbear must hit with a claw attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity.

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System Reference Document -> List of Creatures (SRD)