So yeah, dinosaurs are basically the most metal thing ever.
If you need more evidence of why dinosaurs should be on more metal album covers, just take a gander over there to the left. Look at how unbelievably bad-ass that is! I've seen two versions of this cover, and while the colored one appeals more to me, they are both more awesome than about 95% of the album art out there today.
Metal bands of the world, it's time for you to get to work. I expect to see ten more awesome dinosaur album covers on my desk by the end of the month, or you're fired.