Humans don't have hollow bones like birds do, so how big would our wings have to be to lift us off the ground?

In birds, an average of 16% to 18% of their muscle mass comes from muscles used for flying. In some, up to 30% of their muscle mass comes from the chest. This is also true in bats, though the mass ...

New Research Suggests Birds Do Dream, And Scientists Were Even Able To Translate The Vocal Muscle Activity Of Birds During ...