I hope this gives you an idea of the size of this dude. He is over 3 feet tall. Maybe 4. It's hard to gauge.
Look at him in relation to this full grown duck.
One BIG BIRD!
When he flies away, his wing span is over 6 feet across. Quite something.
EDIT: My brother called it. Its a stork. A wood stork! Wow! Thanks Rob! You can read about the wood stork here: http://www.allaboutbirds.org/guide/Wood_Stork/id