I had no idea there are so many differences between Chip and Dale:

Chip can be identified by his small, black nose and two adjacent front teeth, whereas Dale has a larger nose which is alternately brown, black or red, and he has a gap between his two front teeth. Chip is also usually the more logical and cunning of the two, with Dale being the more dimwitted one who can be smart at times.

Chip's on the left and Dale's on the right:

Oh wow, Dale really does have a black nose sometimes: