What's Going On?
The Cause: Shope (Cottontail) Papilloma Virus
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The growths are caused by the Shope papilloma virus (also known as cottontail rabbit papillomavirus), a DNA virus that induces wart-like tumors—particularly on the head and face of affected rabbits.
These tumors can harden or elongate over time, resulting in spike-like, horn-like, or tentacle-like protrusions that look bizarre and unsettling.
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While typically benign, these growths can cause health issues—like interference with eating or vision—and in rare cases, may become malignant.
Why Now? Recent Sightings in Colorado
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Fort Collins residents have been spotting multiple such affected rabbits, prompting local concern and viral attention online.
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Descriptions of the growths vary from “black quills” to “scabby-looking” protrusions.
Are the Rabbits Dangerous?
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No, the virus is species-specific and does not infect humans, pets, or other wildlife
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Colorado Parks & Wildlife (CPW) recommends observing from a safe distance and not touching or attempting to help the affected animals—doing so can stress them unnecessarily.
Folklore & Science
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These peculiar-looking rabbits may have inspired the jackalope myth—a mythical creature described as a rabbit with antlers. Historians suggest sightings of papilloma-afflicted rabbits may have fueled that folklore.
| Observation | Details |
|---|---|
| Growth Appearance | Wart-like tumors forming spike- or tentacle-like projections |
| Cause | Shope papilloma virus (cottontail rabbit papillomavirus) |
| Health Risk | Generally benign, but may interfere with feeding or vision; sometimes malignant |
| Threat to Others | None—virus is species-specific |
| What to Do | Observe from afar, report sightings, don't touch or feed the rabbits |
| Folklore Link | Possibly explains the origin of jackalope legends |
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