Hair

Hair, feathers, scales, and quills are all modified epithelial cells. Let's take a look.

Human hair at 1600x

This is a human hair. Notice it has a slight scaliness to it. 

Eyelash 1600

Human eyelash at 1600. I couldn't find any indications that it was scaly, but it does have an odd dark line running through the center.

Eyelash 1600

Another view.

Eyelash 100

Human arm hair 1600

Cat hair 1600

This is a little difficult to make out, but cat hair shows the same scaliness as human hair.