Biometric systems can identify you by bone conduction, ear shape, and gait

[Sandy Lomax]

https://www.newscientist.com/article/2085430-the-buzz-of-your-skull-can-be-used-to-tell-exactly-who-you-are/

This article in New Scientist says that skull bone conduction can accurately you, and the link to " ear shape" says  is a better identifier than face recognition, and could identify callers on the phone.