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Re: Campbell's even crazier than a MANIAC? (archeopteryx climbing)

 I noticed something interesting while watching the Documentary 'Planet Earth'. 
Part of the show covered flying lemurs, which due to lack of time, I'm not 
going to describe. So for those who aren't familiar with this 
 What I noticed was that these animals were "flapping"; by this I mean they 
were providing a small amount of thrust by undulating their tail up and down. 
Here is clear example of the most advanced gliding mammal in the world using a 
primitive form of flapping thrust. 
  I also wanted to ask, do animals that live in heavily forested areas 
fossilize easily? If not, this could explain why the major groups of flying 
animals seem to "pop up out of nowhere". Their ancestors could have lived in 
thick jungles where animals would rapidly decompose and be consumed by