Researchers say rare fossil find provides evidence of one theory of evolution . 20 fossilized pterodactyls found in China in rock dating back 160 million years . Comment: The fossils indicate Darwinopterus was about the size of a crow , with long jaws , sharp , pointed teeth and a flexible neck . Scientists say fossils show groups of features changed relatively rapidly .
Researchers say rare fossil find provides evidence of one theory of evolution . 20 fossilized pterodactyls found in China in rock dating back 160 million years . Comment: Scientists say fossils show groups of features changed relatively rapidly .