"Call me Jack" graphite drawing.

It's nonsense, isn't it?  Mammals most certainly DO have facial expressions - I kept our own dogs for over thirty years, and live with my landlord's and landlady's dogs now - I differentiate between them, because my landlord's dog is an ancient border terrier; my landlady, a relatively new addition to the scene, brought her five very different dogs with her: one has since passed on (to which a long story attaches, offering no credence at all to the RSPCA).  Their range of expressions may be limited by comparison with ours, but I still remember, though it was MANY years ago, bringing our dog home from the kennels, as a rescue: she was grinning all over her chops. Maybe tortoises are not exactly rich in facial expression - though it's not entirely absent; rats and hamsters too: it's to do with the eyes in those cases - you can soon tell the difference between a rat who isn't over-impressed with you, and one that thinks of you as its dad - you just have to be receptive to them.   The Great Ralph (TM) (All Rights Reserved) thought I was the bee's knees - he had excellent taste - even when I inadvertently trod on him: he expressed himself with admirable vocal force, but when I brokenly apologized, his eyes crinkled understandingly, and he licked my fingers.... Ee, I'm filling up here....   Anyway: anyone who says animals don't have facial expressions is probably too coldly dim to see them in humans, either!