| The flightless birds and insects of such islands had clearly lost a highly complex function. |
| Penguins are flightless birds that are highly specialized for swimming and diving, and spend much of their life at sea. |
| Yet the bizarre Mononykus had tiny forelimbs with a single digit and was obviously flightless. |
| One of her donations to the museum is reputed to be the only egg in existence of the extinct, flightless dodo bird. |
| Most of the birds classified in the Palaeognathae are also flightless, but not all flightless birds are classified in the Palaeognathae. |
| Unlike other petrels, the flight feathers of diving petrels are moulted simultaneously, leaving the birds flightless while they grow back. |
