 
 <prompt> Which one of dem na flight muscle: the pectoralis, the skeleton, or the forelimb? Based on di question wey dey above, write small tori wey contain di 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 breeding, 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. 