Video

It's clear, if you think about it very carefully, that it would be impossible to breed a goat that had spider silk protein in it. There's no way that mutation would occur under any natural circumstance, no matter how you bred them. Randy Lewis, a professor at the University of Wyoming, has done otherwise; designed a goat that can be used in spinning spider silk,
A documentary short by Field Test, 6 minutes, USA, 2010