I'm surprised the species isn't extinct:
*Can't burrow a protective underground home
*Can't outrun much of anything that wants to eat it.
(Cellar members excluded)
*Can't fly.
*Can't swim fast, if at all.
*Can't climb trees to get away from predators.
*Nice claws, but most predators can still clean it's clock.
Flightless birds are a risky proposition. Emu, and Ostrich are the only ones I know of that live on land, and have been successful. (Roadrunners can fly a bit - and do nest above ground)