bird flight
...that the principles of bird flight are the same as used in aircraft, with lift being provided by an aerofoil?
...that the principles of <b id="mwBEM"><a href="./Bird_flight" id="mwBEQ" rel="mw:WikiLink" title="Bird flight">bird flight</a></b> are the same as used in <a href="./Aircraft" id="mwBEU" rel="mw:WikiLink" title="Aircraft">aircraft</a>, with <a href="./Lift_(force)" id="mwBEY" rel="mw:WikiLink" title="Lift (force)">lift</a> being provided by an <a href="./Airfoil" id="mwBEc" rel="mw:WikiLink" title="Airfoil">aerofoil</a>?