Question

Energy requirement is less for amphibians than for birds 0th

Answer 1

Birds require more energy because they have to fly in sky against the gravitational force and the direction opposite to the direction of air whereas amphibians live in water as well as on land so they don't have to go against the direction of gravitational force so they do not require more energy

Answer 2

They requires much more energy to flight.

Also there are almost 2million mitochondrias in birds