Krenshar are a monster race that is © to Wizards Of The Coast, unless the company has changed names again :) they can pull their face flesh back to reveal an alost bare skull which should shoo away any enemies.
the image in the monster manual (earlier issues were dubbed 'monstrous manual') shows a Krenshar in this situation only, with a really odd stance, so i decided to create my own picture for a role playing character for D&D3e. so this is my take on what those beings might look like when they're NOT out to bite yer bluddy head off. ;)