Humanologist here. This is actually a common confusion, you also have to take into account the colour of the hair on their head to differentiate them. To help, you can recite:
black on white, go and bite
yellow on white, go and bite
black on black, bite and whack
Mmmh now that I think of it, the identification stage might not be that useful
Oh dang, a white one. Those are the most dangerous.
Humanologist here. This is actually a common confusion, you also have to take into account the colour of the hair on their head to differentiate them. To help, you can recite:
Mmmh now that I think of it, the identification stage might not be that useful