Wolverine

A Wolverine is a human who, upon the rising of a full moon, turns into a fearsome beast. Wolverines can be distinguished by their claws, pointed molars, pupils of the eyes, snout shape, tufted tail, fur over entire body, and being hunched over. They look similar to a werewolf. At all other times, they appear as normal humans. This condition is caused by infection with lycanthropy. There is no known cure, but the effects can be lessened with a certain potion.

Infection
Lycanthropy is a magical illness spread by saliva-blood contact thus, a human bitten by a werewolf during full transformation will become a werewolf him or herself. However, it a human is bitten by a werewolf not during full transformation, the victim will become a wolverine. A person can also become a wolverine by being scratched by another wolverine.

Wolverines seldom have children, and the offspring will not inherit the infection unless the wolverine is a pure wolverine, which is extinct now. One upside for wolverines is immunity. Wolverines will never get sick no matter is they are transformed or not and any cuts or wounds will heal themselves almost immediately. Also, wolverines are capable of great agility and stamina, able to jump over 20 feet at a time, perfect reflexes, and grappling abilities allowing them to walk on walls and ceilings and such. Along with all of these abilities include extraordinary strength able to lift up to a ton at any given time.

Monthly Transformations
On every full moon, a wolverine will go through an incredibly painful transformation from a human into a wolverine. Unlike werewolves, wolverines are able to retain there mind while in wolverine form. Therefore, wolverines are still able to control themselves and communicate and do everything as if they were in their human form, they just look different.

Treatment
Unfortunately, there is no permanent cure for wolverine lycanthropy. However, the wolverine can retain from transforming by consuming Wolfsbane Potion the day of the transformation. Wolverines that don't transform through the machinations of this potion can still transform parts of their body as they wish, just will never force transform. But, if a person does not take the potion until after the transformation and then takes it, it will keep them in their form forever, which is why very few wolverines wish to take that chance.

Also, the Homorphus Charm can force a wolverine back into human shape.

Prejudice
In the wizarding world, werewolfes are regarded with fear and disgust, however, wolverines are not discriminated whatsoever as long as they keep to themselves during the transformation.