"There's a common misconception that all you do is take a human wig and place it on the chimp. That really doesn't work. One, the head is smaller and two, the head has a fundamentally different architecture of the anatomy; the difference in relation to the brow to forehead and in the positions of the ears."

"It's critical that we have a looseness right around the ear area because the chimps are very sensitive to anything tickling the top of its ear, so if I don't structure the wig exactly to clear the ear so that they're comfortable, then the chimp isn't going to wear it. He'll pull it off and start scratching."