This is probably the best creature Ive come up with
Its called a Vipex and I drew it in paint

The vipex is a carnivore that stands about ten feet high and can rear up to around 20 ft and can crouch stealthly to 3ft. To attack it crouches down and draws its head back behind its giant blades then springs very swiftly forward, impaling its prey and then eats it. It mostly preys on larger animals but if it is bothered by a smaller animal it can usually scare it away.
ImageShack - Hosting :: vipexoa2.png

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I'd put something clever here, but you wouldn't get it.