english: So therefore, they must have something within their DNA that ables them to deal with the metabolic stresses, particularly of flight. They expend three times more energy than a mammal of the same size, but don't seem to suffer the consequences or the effects.
non_english: Zato mora da postoji  nešto unutar njihovog DNK što im omogućava da podnesu  opterećenje metabolizma, posebno prilikom letenja. Oni troše tri puta više energije od sisara njihove veličine, ali izgleda da to ne ostavlja nikakve posledice na njih.