The pigeon and the ostrich are both birds; one can fly and the other cannot.

An ostrich does not fly through the air.

Ostriches are incapable of flight.

The ostrich has wings, but it cannot fly.

An ostrich cannot fly any more than a kangaroo can.

That's why ostrich meat costs more than twice as much as beef and pork.

This is the most beautiful ostrich I've ever seen.