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| Darwin's Tubercle on Homo sapiens and Macaca fascicularis |
I have Darwin's Tubercles and I can wiggle my ears without wrinkling my forehead. Both these things are vestigial fossils of my remote ancestry.
Darwin's Tubercle was described by Charles Darwin in The Descent of Man, although he called it the Woolnerian tip after the sculpture Thomas Woolner who actually first recorded it.
It has no known function in humans, but in our simian and anthropoid cousins it, or rather the point, is probably useful in focussing sound. It is a vestige of the ear point found in many simians and, presumably, in our common ancestors. Mine is larger on the right ear than on the left, where it's a tiny little nodule I can just about feel but the important thing is that I have them. Only about ten percent of us do.
And, I can wiggle my ears! To quote from Why Evolution Is True by Jerry A. Coyne:
... if you can wiggle your ears, you're demonstrating evolution. We have three muscles under our scalp that attach to our ears. In most people they're useless but some people can use them to wiggle their ears. ... These are the same muscles used by other animals, like cats and horses, to move their ears around, helping them localize sounds. In those species, moving the ears helps them detect predators, locate their young, etc. But in humans the muscles are good only for entertainment.But, to be fair on the rest of you, it's not just me. We're all walking evidence for Darwinian Evolution. These quaint little vestigial structures merely confirm what the rest of our anatomy, physiology, biochemistry and genetics are all shouting at us so loudly that those who are afraid to hear it have to howl even more loudly to drown it out.
Footnote: you may be able to wiggle your ears if you practice enough. Here's how: How To Wiggle Your Ears.
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