Ostriches are Flightless Birds, most of which are classified as "ratites." These include the rhea, emu, cassowary and kiwi. They have flat breastbones (no anchor points for large wing muscles) and the concurrent shorter wings.
Emus, ostriches, and kiwis are three birds that cannot fly.
Penguins, Emus, Ostriches, Kiwis are all birds that can't fly
Penguins, ostriches, and chickens!
mammals
Yes all birds can fly except ostriches and penguins
penguins, ostriches, emus, kiwis, kakapos...
There are several birds that cannot fly, all the species of Penguins, Emu, Ostrich, Kiwi, and the Cassowary are a few.
No, ostriches aren't mammals because they don't have fur like animals and and they don't have teeth like mammals do. They do not nurse their young, as mammals do. Ostriches, though they don't fly, are classified as birds
Ostriches wings are too small in comparison to their weight.
Ostriches and emus do not fly and run quite fast.
penguins cant fly, and chickens cant propperly fly!
Flightless birds have a small keel and wings.