Basically during prehistoric times there were long-tailed flying reptiles known as pterodactyls that dominated the skyline. These beasts were believed to have been replaced by a shorter-tailed version, one that was much more advanced than the other. However, there was no evolutionary link between the two prehistoric animals until now.
http://www.biologynews.net/archives/2009/10/13/new_type_of_flying_reptile_discovered.html
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