Nah.

Cliff racers don't eat or kill dragons, they don't stand a chance... They simply eat all the food dragons also eat, so the dragons left because they couldn't compete in the hunt. They didn't leave because they were actually killed by cliff racers.

What a shame.... Flying Piranhas! They smeel your blood! And About dragons that were sleeping? Not sure, they could have a time to react the bites.

Jiub drove those bastards into Oblivion

If they bring dragons to extinction, yes! At least cliffracers didn't kill useful NPCs in towns...

1 on 1 a cliff racer won't stand a chance no. But cliff racers are a pest. Given the chance they'll attack in larger numbers, even stalking while looking to ambush. Plus, cliff racers are extremely agressive. They'll attack everything and anything (with sadly a massive preference for the human player..), and they'll just keep coming and coming.

And who knows cliff racers don't eat anything they can kill, anything that has perished? They don't seem like herbivores to me.

Cliff racers aren't that agressive you can see plenty of other animals in game in area's where there are also cliff racers... So obviously they learn to leave some people alone. Just not you, or Jiub...

They're supposed to attack anything and everything according to their description. Sadly they only attack the player, but that's just poor game mechanics.

i think if they where to add them this time around they could do it properly because on TES 3 they didnt have the right technology to animate them properly because they couldent actualy fly down they could only hover lol

Which was great, because if they could actually fly logically they would have caused a lot more problems...

Imagine a bird like if you were tryng to kill a slaughterfish in the water. You are right.

do not remind me of those damned Racers!

Skyrim already has its Cliff Racers. They're called Draugr Deathlords...

They don't fly or screech - though they may send YOU flying and screeching.

Cliff racers, not even a million of them, could take down a dragon - Dragons fly faster, so all it has to do is use its speed to create a cliff-racer funnel behind it, spin around in midair, and roast/freeze them ALL in a single breath.

In mid-air combat straight-line speed accounts for very little. Dragons land from time to time, and they often doze off in blissful tranquility. Cliff racers often stalk and ambush, preferably surprise attacking what they take on.

If it would have been so easy for dragons to bbq cliff racers than there would have been dragons in Morrowind, not cliff racers. Cliff racers will overcome dragons, it's a matter of sheer numbers and attrition.