Moa
Moa inhabited New Zealand his height reached the underground of the height even to 3.6. New Zealand was a real paradise for birds before there a man didn't reach, very much they here liked it the complete lack of predators on the earth contributed oneself for gradual loss of flying.
Moa with time lost wings and simply started walking to walk. His diet consisted of leaves, fruits, rushes and roots.
The smallest kinds reached the weight not more how specimens achieved 20 small kilogrammes 3.6 of the underground of the height and weighed of about 250 kilogrammes, females were 2 cases more serious than males.
Before the appearance of the man a Haast's eagle was an only natural enemy.
Since these birds didn't fly, weren't aggressive but in turn massive birds became a simple and tasty titbit for people.