flightless

adj.

（鸟或昆虫）不能飞的；

1. The penguin is a flightless bird.
   企鹅是一种不会飞的鸟。
2. The huge flightless birds can get very protective of their territorail territory.
   这种丧失飞行能力的大鸟对自己的领地有很强的保护意识。

Flightless bird from the Cretaceous of Mongolia
Flightless birds: when did the dodo become extinct?
Female-specific flightless phenotype for mosquito control.
Are flightless Galapaganus weevils older than the Galápagos Islands they inhabit?
Flightless brown kiwis of New Zealand possess extremely subdivided population structure and cryptic species like small mammals.
Relationships of the extinct moa-nalos, flightless Hawaiian waterfowl, based on ancient DNA
A novel human Cl(-) channel family related to Drosophila flightless locus.
Magnificent Mihirungs. The Colossal Flightless Birds of the Australian Dreamtime by Peter F. Murray; Patricia Vickers-Rich
Fine Scale Movements and Habitat Use of Black Brant During the Flightless Wing Molt in Arctic Alaska
Recent habitat fragmentation due to roads can lead to significant genetic differentiation in an abundant flightless ground beetle