DONOT WASTE THIS ENERGY

The neurons of the brain require a lot of energy. 75% of the blood sugar created by the liver is consumed by the brain. The brain also consumes 20% of the oxygen a human breathes. The energy consumption for the brain to simply survive is 0.1 calories per minute, while this value can be as high as 1.5 calories per minute during crossword puzzle-solving. The demands of the brain limit its size in many species. Molossid bats and the Vespertilionid Nyctalus spp. have brains that have been reduced from the ancestral form to invest in wing-size for the sake of manoeuverability. This contrasts with fruit bats, which require more advanced neural structures and do not pursue their prey.