Give 5 examples of adaptations birds have acquired and explain how they contribute to their ability to fly

Pneumatization/honeycomb structure in bones allows for the birds to weigh less and be buoyantBirds have lightweight feathers on the wings hence allowing for a higher lift to weight ratio. Birds take in very little water in their bodies hence reducing  on the carried weight. This is why birds excrete their waste as uric acid that requires less water to eliminate compared to ammonia Instead of boned jaws, birds have beaks made of keratin which is lightweightThe breastbone of birds is enlarged allowing for the attachment of muscles involved in flight