Being Macro isn't as easy as you might think, Blood pressure must rise or you black out when you stand up, paws and wings must grow more than one's body or you will sink into the ground, or lose the ability to fly. The problem bing that your body volume increases by the third power, while foot and wing area increase by the second.

You body must have ways to remove excess heat build up, breathing and circulation become harder and must be improved. Lung area to lags behind body growth so they must get bigger, better or both. Most of all the more massive you are the bigger your limb bones and spine must be to take the weight, or you must improve bone strength.

Passing these tests and moving on, at exceptional sizes the nervous system becomes problematic. Stand on a thorn and you won't know till next thursday!

Well I'm back and I been thinkin'

Bronzewing

The Dark God.

Oh, I would kill to be licked by a giant fox ^^

That being said, how would a macro get all the food it needs to eat?

Rampaging, hungery macro furrys.....

It's alot more fun then Atomic Warfare ^^

It is possible for the creature to have hollow bones and a thin frame similar to that of avian dragons.

additionally, a skeleton that has a high carbon content is much better than one with calcium.