 
 <prompt> Which of the following no be use of flight: feeding, breeding, or a lightweight skeleton? Given the previous question, write a context wey contain the answer. E fit be 1 - 20 sentences. Context: <response>: Most birds fit fly, wey make dem different from almost all other vertebrate classes. Flight na di main way wey birds dey move around and e dey use am for mating, feeding, and to run from predators. Birds get different adaptations for flight, including lightweight skeleton, two big flight muscles, the pectoralis (wey dey make up 15% of di total mass of di bird) and the supracoracoideus, as well as a modified forelimb (wing) wey serve as aerofoil. Wing shape and size dey determine di type of flight wey a bird species fit do; many birds dey combine powered, flapping flight with less energy-intensive soaring flight. About 60 bird species no fit fly, like many wey don die. Flightlessness dey happen for birds wey dey isolated islands, probably because of limited resources and no land predators. Even though penguins no fit fly, dem dey use similar muscles and movements to "fly" for water, like auks, shearwaters and dippers. 