Residents of Fort Collins, Colorado, have been stunned by sightings of
wild rabbits exhibiting bizarre, tentacle-like growths emerging from their
faces. These freakish protrusions are caused by a viral infection known as Cottontail
Rabbit Papillomavirus (CRPV)—also known as the Shope papilloma virus.
Originally identified in the mid-1930s, CRPV causes hardened, wart-like
tumors—often appearing around the face, neck, and ears—and in severe cases can
impair a rabbit’s ability to see, eat, or drink. Though rare, treatment options
vary; less severe cases may heal naturally within a year, while others suffer
greatly.
The virus primarily spreads through biting insects such as mosquitoes
and ticks, but can also be transmitted between rabbits via shared bedding,
food, or water, and, less commonly, through blood transfusion.
Growers of domestic and wild rabbit species—including brush rabbits,
European rabbits, and snowshoe hares—should take note, although incidence is
predominantly reported in the U.S. Midwest. Notably, the virus doesn't occur in
Europe or the UK.
Important: CRPV is not zoonotic, which means it cannot transmit to
humans. Still, experts urge caution—avoid handling affected animals. Colorado
wildlife officials warn that these disfigured rabbits, while fascinating, pose
a risk if approached or touched.
