Horses Are Born with Strange Fairy Fingers Under Their Hooves

At birth, foals display peculiar soft structures beneath their hooves that help shield the mother’s tissues during gestation and birth.

An Essential Protection

If this temporary tissue, known as the eponychium, is also observed in other ungulates, including cows, deer, and even rhinoceroses, it is particularly developed in equids, for which it is commonly referred to as slippers.

During uterine development, this perioplic membrane has a gelatinous texture and rapidly changes after the foal is born. Its exposure to air contributes to its hardening and retraction, eventually leading to the appearance of a crest resembling the band of skin visible at the base of our nails.

Under the hoof, its curious fluffy appearance lasts only a few hours. Once the foal stands on its feet and begins to move, these “fairy fingers” wear away quickly, revealing the underlying keratinous layer.

Newborn foals are born with what horse lovers call “fairy fingers” or “golden slippers.” The scientific name for these soft, rubbery coverings is eponychium. They form around the foal’s tiny hooves before birth, giving each foot a padded, cushion-like appearance.
These golden… pic.twitter.com/AxKgvdOtPS

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This envelope plays a crucial role during fetal development by shielding the uterine tissues from the newborn’s hoof strikes. During birth, it also reduces the risk of damage to the genital tract.

An Adaptation to Outwit Predators

The in utero development of hooves in herbivorous mammals may be linked to their position in the food chain. Because birth and the expulsion of the placenta can draw predators, it is crucial that newborns—especially vulnerable ones—are able to move unaided very soon after birth.

Although today only a single wild horse species remains—one that nearly vanished in the mid-20th century—these equids were once commonly targeted by wolves, bears, and large felids.

In case you didn’t know, horses’ feet also bear peculiar outgrowths that are remnants of their evolutionary history.