a credible alternative to the current land-based dinosaur to bird theory. Monday, May 10, 2010 Pycnofibres http://en.wikipedia.org/wiki/Pterosaur "Pycnofibires At least some pterosaurs were covered with hair -like filaments known as pycnofibres , similar to but not homologous (sharing a common structure) with mammalian hair. Pycnofibres were not true hair as seen