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Flight first evolved in the insects. There are several hypotheses about where the wings came from. One believes that they developed from extra legs that may have existed. Any theory would be hard to back up, as there is limited fossil evidence from this period.

In vertebrates, wings developed from the arms and were probably first used to glide from tree to tree, before developing powered flight. Styracosaurus Rider (Speak to the Rider, your Lord and Master) {Look upon my servants} 16:33, November 13, 2011 (UTC)

Yes, but everything evolves with a purpose, surely? Evolution doesn't add unnecessary features. So why were wings absolutely necessary? Toothless100 - Talk to me 16:35, November 13, 2011 (UTC)
Evolution isn't a constant leap forward. It can move in many ways. Sometimes certain mutations produce favorable effects, or sometimes unfavorable. Evolution is commonly termed "survival of the fittest", but it is a process constantly changing, and unless an organism is adaptable it may not succeed. In the words of Thomas Holtz, a more proper description of evolution is "descent with modification". Styracosaurus Rider (Speak to the Rider, your Lord and Master) {Look upon my servants} 16:45, November 13, 2011 (UTC)