the.com/hoof

A toenail that evolved into a lifestyle, then into shoes.

means The hard, horn-covered foot of animals like horses, cattle, and deer, built to take the pounding of a life spent standing and running.

from Hoof comes from Old English hōf, tracing back to a very old Germanic root (related to German Huf and Dutch hoef), which itself likely connects further back to an ancient Indo-European root meaning roughly 'to kick' or 'paw at the ground' — the word has been describing the same thumping, ground-striking body part for thousands of years.

actual structure
keratin wall grown around a single enlarged toe
horse count
one toe per leg, unlike your clumsy five
growth rate
grows constantly, like a fingernail that bears weight
shared material
same protein as your hair and fingernails
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