This is one of my favorite strips!
But thinking about it, how much of his head is flesh?
His face isn’t much bigger than normal.
Unless his jawbone has a 1.5 foot chin, most of the head under his mouth is going to be skin and fat.
And if his skull is normal sized, his neck bones must be extremely distended, and his neck muscles must be extremely strong to support the weight of the entire head.
The strip is just better to contemplate as a fanciful idea and move on.
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Do not attempt to bring logic to The Far Side. That way lies madness.
Shrunken heads are made just with the skin, so it doesn’t really matter what’s underneath. He’d still make a larger-than-average shrunken head, albeit with a tiny face comparatively.
Why do you know that!?
On second thought, please ignore that question.