William Beebe’s hypothetical -Tetrapteryx- with four wings 1915 Published May 26, 2015 at 500 × 300 in DINOSAUR-TO-BIRD EVOLUTION CHALLENGED – (Repost) ← Previous William Beebe’s hypothetical -Tetrapteryx- with four wings 1915 Share this: Email a link to a friend (Opens in new window) Email More Share on Pinterest (Opens in new window) Pinterest Like Loading...