All of today's flightless birds evolved from birds that could fly.
The flyingfish? Maybe. But they have yet to evolve ways of surviving ouside water for extended periods of time.
Ok.. so from what i gather, the general trend is that more animals tend to loose the ability of flight, than animals evolve to gain flight, in the last say... 60 million years? Why is that?
Is there a rational explanation with good proof to describe it?
Insects: Anything evolving to gain flight. The stick insect "Phasma gigas" lost its ability and "appears" to be "re-evolving" its wings (Contrary to Dollo's Law).
As far as i know i only know of insects that somewhere along the line lost their ability of flight. Eg. Lice, fleas, some beetles (All belong to Pterygotes)
Can't scientists design an experiment to accelarate the "re-evolving" of wings of the Phasma gigas stick insect. (http://www.astrobio....article&sid=358)
We must be living in a dull era of evolution as nothing constructive seem to evolve. (Oh wait, they think we might be getting smarter)