Birds don't need 150,000 litres of jet fuel to fly across the ocean. Given that the development of airplanes was made by studying birds I'm not sure I see your

Birds don't need 150,000 litres of jet fuel to fly across the ocean. Given that the development of airplanes was made by studying birds I'm not sure I see your point. The 1889 book "Birdflight as the Basis of Aviation" is one example.