This flightless species is only known from bones and was presumably driven to extinction by whalers visiting the island.

Some birds evolved into flightless species after their ancestors arrived, including several species of rails.

We might expect even a sudden mutation, if so far-reaching as this (a flightless species acquiring flight) to take from three million to twelve million years.

The dark bush-cricket (Pholidoptera griseoaptera) is a flightless species of bush-cricket.

Jamaica and Cuba have always been separated by the sea, so it is improbable that a flightless species could reach the other islands.

The taxon has approximately forty species, including some flightless species.

This flightless species is known from subfossils from a number of archeological sites and from one possible 1894 record (Phillipps, 1959).

She caught a gestalt of thin-boned, feathered creatures, descendants of some flightless, pseudo-avian species.

This flightless species was probably derived from the ubiquitous Buff-banded Rail stock.

As a flightless species in the rich biozone of the African savanna, the ostrich must face a variety of formidable predators throughout its life cycle.