C. R. "Chuck" Downing
shared:
6/8/2017 1:05:06 AM
Reply#SciFact Bird feathers and reptile scales both contain keratin @SherryFrazier https://t.co/NFRehq1kcy pic.twitter.com/WUUI7SeznP
— C.R. Downing (@CRDowningAuthor) June 8, 2017