Answer the following question given this paragraph: 

Some birds have lost the ability to fly during the course of their evolution. Several flightless birds are shown in Figure below . They include the ostrich, kiwi, rhea, cassowary, and moa. All of these birds have long legs and are adapted for running. The penguins shown in the figure are also flightless birds, but they have a very different body shape. That’s because they are adapted for swimming rather than running.


Q: The ostrich, kiwi, rhea, cassowary, and moa are examples of what kind of birds?


A:
flightless