A giant flightless bird like the dodo is on the extreme end of avian evolution.
Several people here have argued that Caudipteryx is in fact a flightless bird.
The flightless birds and insects of such islands had clearly lost a highly complex function.
The kakapo, a flightless bird, was particularly vulnerable to predators.
Rheas are large flightless birds native to South America.
Thus spores and minute, winged insects stay suspended longer than seeds and large, flightless insects.
Most of the birds classified in the Palaeognathae are also flightless, but not all flightless birds are classified in the Palaeognathae.
Caudipteryx has short forelimbs and a feathered manus and is likely to have been a secondarily flightless bird.
The tam is thought to have evolved to survive passage through the gullet of the island's biggest, flightless bird, the dodo.
The living ratites (ostriches, emus, kiwis, and the extinct moa) are an ancient lineage of flightless birds.