What is another word for flightless birds?
Pronunciation: [flˈa͡ɪtləs bˈɜːdz] (IPA) 
Flightless birds are a group of avian animals that are unable to fly due to physical adaptations or lack of flight muscles. Synonyms for flightless birds include ratites, which is a group of bird species that share a flat breastbone, such as ostriches, emus, and kiwis. Penguins, which are also classified as flightless birds, are commonly referred to as marine birds because of their aquatic lifestyle. Other synonyms for flightless birds include land birds, ground birds, and cursorial birds, highlighting their adaptation for terrestrial locomotion. Despite their inability to fly, flightless birds are still remarkable creatures, possessing unique characteristics and adaptations that make them fascinating subjects of study and observation.
