An adult sharp-shinned hawk often avoids the coastal route and may veer southwest when it reaches the Appalachians. We will only discuss their flight feathers - another unique feature. To start with, the oldest fossil feather looks just like a modern feather - so there is no evidence that it evolved. Besides the fact that there is no evidence that the feather evolved, there is also no possible explanation of how flight feathers evolved from scales. The adaptive value of an intermediate structure between a scale and a flight feather is not very obvious.
Flight feathers are extraordinarily detailed in construction and strong for their weight.
The upstroke of the wing forces the feather's vanes to open like Venetian blinds. This effect lets the air pass through and offers little resistance. The downstroke is the power stroke - the feathers twist back into a flat wing surface, and move the bird through the air. Not only do the individual parts of birds appear to be designed, but the bird itself is a synergistic whole, created for the purpose of flight. Conclusions There are arguments that birds evolved from dinosaurs, but there is no evidence.