Randall missed that a plane can lose it's ability to fly via excessive icing on surfaces. While it is not usually the way in which it is cured (using deicing solution and onboard aircraft systems to melt them,) sunbathing the plane in greater than freezing temperatures is an excellent way to regain the ability to fly. (And without additional energy cost, too!) 126.96.36.199 17:58, 30 January 2017 (UTC)
Perhaps we should mention the pre-twentieth century attempts at powered flight some of which were powered by flapping.
Also should we mention that a hta craft pwered by flapping would be an ornithopter.
Given their is only one David Attenborough and he does not spend his entire life making wildlife documentaries the chance of his observing any individual bird copulation is remarkably small.
188.8.131.52 19:28, 30 January 2017 (UTC)