"Oh, I have a plan for making a boat move without poling it or rowing it," he answered.
"Yes, there is a better way, and that is by rowing," said Christopher.
Sailing is hardly ever practised, and squalls on the lakes are often dangerous to the rowing-boats.
The only really aberrant modifications of the wing-muscles are found in the Ratitae, where they are, however, all easily explained by reduction, and in the penguins, where the wings are greatly specialized into blades for rowing with screw-like motions.
Flightless, wings transformed into rowing paddles.