What bird can outrun a horse and roar like lion but cannot fly?

Here's why:

* Outrun a horse: Ostriches are the fastest birds on land, capable of reaching speeds up to 43 miles per hour.

* Roar like a lion: While not a true roar, ostriches can make loud, deep booming sounds that resemble a lion's roar.

* Cannot fly: Ostriches have wings but are flightless.