Murres, which resemble flying penguins, have the highest wing-loading of any bird, which results in exceptionally high flight costs and could explain why Antarctic penguins have evolved flightlessness. Credit: Kyle H. Elliott.
phys.org/news/2013-05-evidence-birds-gave-flight-swimmers.html
Sorry.
Murres, which resemble flying penguins, have the highest wing-loading of any bird, which results in exceptionally high flight costs and could explain why Antarctic penguins have evolved flightlessness. Credit: Kyle H. Elliott.
phys.org/news/2013-05-evidence-birds-gave-flight-swimmers.html