Dr. Bernard Heuvelmans. His comments are as follows:
In all furry animals the hair has a definite pattern, that is, on each area of the body the hairs are oriented in a certain direction. For instance, on a chimpanzee's arm, or even on a man's if he is hairy, they go down from the shoulder to the elbow, and up from the wrist to the elbow. This definite hair pattern can be seen even on photographs of animals from the way the light shines on their fur.
On the creature shown on Patterson's film there is nothing of the sort. As can be seen from the way the hairs shine, giving the fur a speckled appearance, they point in all directions (compare the blowups of the film with photographs of gorillas or, better, of certain bears, which have 'short, shiny, black hair', and you will see that in the latter, the shine on the fur shows that on each part of the body the hairs all point in the same direction).
The aspect of the hair of the creature in the film is exactly what should be expected from artificial fur--whether thick velvet or nylon fur--in which all threads (not actually hairs) are attached uniformly on some canvas base. When you stroke this material in different directions, the artificial hairs get bent in these directions and remain so until you brush them all carefully in the same direction.
Patterson adds--which is also seen in the film-that 'even her big, droopy breasts' are covered with short shiny black hair. This would of course be possible in some unknown species of man, but it would be rather improbable to say the least. In all larger apes the breasts have a slight tendency toward swelling, and even dropping a little, when the female is nursing its baby or if it has been nursing many of them, but even in such hairy primates the chest is almost naked.
I want to add that this (to me) obvious hoax does not shake at all my firm conviction that some large unknown human-like primate lives in the northwest of the United States and in the western provinces of Canada, not to mention of course certain mountain ranges of northeastern and central Asia."