Hair follicles
Fine hairs emerge from follicles in the skin. Oil glands help give velvet its characteristic sheen.
THE INTERACTIVE FIELD GUIDE / 01
ELK BIOLOGY, UP CLOSE
SOFT OUTSIDE.
BONE IN
THE MAKING.
That fuzzy rack is alive with activity. Meet the skin that helps an elk grow an entirely new set of antlers.
EXPLORE THE ANATOMYREAL ELK. REAL FIELD FOOTAGE.
WATCH VELVET COME OFF.
Watch bulls rub their antlers as velvet comes away. Then explore the living tissue behind it in the anatomy guide below.
VELVET / noun
A specialized, hair-covered living skin surrounding a growing antler. Rich in blood vessels. Supplied with sensory nerves.
01 / THE ANATOMY LAB
GO BENEATH
THE FUZZ.
Select a structure. See where it lives and what it does.
SCHEMATIC / NOT TO SCALE
01 / VELVET SKIN
The living outer layer.
A thin epidermis and a deeper dermis cover the growing antler. Fine hairs give this specialized skin its velvety appearance.
LOOK CLOSER +
The velvet is skin. The antler forming beneath it is a separate structure.
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The tip-to-base layout matters: new tissue develops near the tip; more mature bone lies farther down. Anatomy source ↗
A LITTLE DEEPER
HAIR. SKIN.
A LOT GOING ON.
Two skin layers
The epidermis forms the outer barrier. Below it, the dermis contains connective tissue, follicles, vessels, and nerves.
A fibrous sleeve
A membrane surrounds the developing antler beneath the skin. Around bone, it is called the periosteum.
02 / THE LATE-SUMMER CHANGE
WHY DOES IT
LOOK BLOODY?
Follow the same antler through the transition. The skin comes off. The bone stays.
ILLUSTRATED SEQUENCE / TIMING VARIES
STAGE 01
Alive under velvet.
Blood vessels support living skin and developing tissue. The velvet stays attached while the antler lengthens and bone forms.
- SKIN
- Intact, living skin
- BLOOD SUPPLY
- Active circulation
- ANTLER
- Growing & mineralizing
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Does velvet turn into bone?+
No. Bone develops beneath the velvet. The skin covering is eventually shed, exposing the antler that has already formed.
Can an elk feel its velvet?+
Yes. Velvet contains sensory nerves, and growing antlers are sensitive to injury. That is different from the exposed hard antler after velvet has been shed. A photo alone cannot tell us what an individual elk is feeling.
Is antler bone like our bone?+
Both contain a collagen framework reinforced with mineral, largely calcium phosphate. The extraordinary part is the cycle: an elk grows a new rack, exposes the hard bone, then eventually casts the antlers and starts again.
Does this happen every August?+
August is a common transition period in Yellowstone. The timing varies with population and individual condition, so the sequence is more reliable than one calendar date.
Is shedding velvet the same as shedding antlers?+
No. Velvet comes off in late summer as the antlers harden. The rack stays attached through the rut. Casting the entire antler happens later, commonly in late winter or spring.
FIELD NOTES & SOURCES
THE SCIENCE
BEHIND THE STORY.
The diagrams simplify deer-family anatomy to explain elk biology. Colors, particle movement, and tissue proportions are illustrative, not microscope measurements.
National Park ServiceElk and their antler cycleMississippi State UniversityAntler growth and tissue structurePrice et al. · Journal of Anatomy, 2005How antlers regenerateGene Expression of Axon Growth Promoting Factors in the Deer AntlerVelvet skin and growing nervesDeer antler renewal gives insights into mammalian epimorphic regenerationThe annual regeneration cycle
Photograph: MONGO / Wikimedia Commons. Released into the public domain by the photographer. Cropped for this page.
KEEP THAT CURIOSITY GOING