They have bigger bodies and need more power to fly.
Some wings have eye like patterns that look like a bigger predator.
some birds fly and some birds don't but have wings, the wings balance them so they wont fall so i suggest '''wings and feet or feet''' wings and feet cause others can fly and feet cause other don't like chicken and others hope i help :)
Flightless birds like the Emu and Ostrich tend to have big heavy legs and small wings. Birds that can fly are more streamlined and have bigger wings. These wings have cross-sections shaped like those of aeroplanes enabling them to glide. Their feathers are flat and light in weight. Some of the bones in their skeletons are hollow as well.
No. Some flightless birds such as the kiwi have very small, rudimentary wings. Other flightless birds such as the ostrich have larger wings, but they are still small and quite useless for flight.
some birds are to big for their wings to make them fly
Feathers are the only adaptation that all birds have. Birds have wings. They are the only vertebrates that do have wings, even though in some birds they are non-functional. However, they are not the only living creatures to have wings, as many insects do as well. Thee are some adaptations that are not found in all species of birds, but which are unique to birds. Flighted birds have light weight hollow bones developed for flight, but this is not found in all birds. Some birds have complex adaptation of the larynx which allows high speed complex bird calls to be created, but again, this is not found in all birds.
Flightless Birds like the Emu and Ostrich tend to have big heavy legs and small wings. Birds that can fly are more streamlined and have bigger wings. These wings have cross-sections shaped like those of aeroplanes enabling them to glide. Their feathers are flat and light in weight. Some of the bones in their skeletons are hollow as well.
Because they have the same characteristics such as warm-blooded, egg-laying, feathered vertebrates of the class Aves, having forelimbs modified to form wings. What distinguishes Birds from other animals is the presence of feathers.
a butterfly flies by flapping its wings but some butterflies do not fly like other butter flies do. Some butterflies flies like other birds
wings are helpful.
All birds have some sort of wings.
Most birds use their wings for flight. Some of the flightless birds, or birds which do not fly much, may use their wings just for balance, especially when perching (e.g. chickens). For some flightless birds such as the kiwi, their wings appear to be without purpose.