in P1, anytime's bio eyes flash yellow. AVPR, wolf's are blue. predators, two of the BSPs' are yellow. In the scene when Berserker ripped Stans' spine n skull n Falconer uncloaks, I noticed Berserker's had a dim glow of red then faded away! No lie watched it on bluray on my PS3! its probably on dvd too! see for yourself!