Bad Wigins wrote:
Dude! Cats and other animals going fast has nothing to do with light weight or myostatin. Are cheetahs crazy muscular? No more so than most wild predators, and much skinnier.
Here's the deal with fast animals: aerodynamics. A cheetah is built like a spear and slices into the wind. It's also low to the ground so air doesn't get under it. Nothing slows it down except having to keep moving its feet backwards at 60mph, which doesn't take that much effort - a baseball pitcher can move his hand 100mph.
Something else quite obvious is that a cheetah and other very fast four legged animals use their entire body to sprint. Curling up and recoiling down the length of their spine with all their muscles.
Not to mention two extra legs adding in extra propulsion to their forward movement without the negative effects of a shorter stride length in a bipedal animal.
The real question is how does an ostrich run so fast... That's food for thought.