A werewolf is a human being who, upon the complete rising of the full moon, turns into a fearsome and deadly near-wolf. Werewolves can be easily distinguished from regular wolves by several small distinguishing characteristics, such as the pupils of the eyes, the snout shape, and the tufted tail. At all other times, they appear as normal humans, though will often seem to be ill as the full moon approaches. This condition is caused by infection with lycanthropy, usually occurring when a human is bitten by a transformed werewolf. A werewolf differs from an Animagus in the fact that he or she does not transform by choice. With each full moon the person transforms and no longer remembers who he or she is, and would kill even their best friend given the opportunity. In spite of that, they seem to be able to recall everything they have experienced during the transformation, upon reverting to human form. There is no known cure for either the bite of a werewolf in his wolf-form or the bite of a werewolf in his human form, though the Wolfsbane potion is the only known potion that can in any way make a werewolf less dangerous by allowing him/her to keep his/her human mind during transformation. Lycanthropy is a magical illness known to be spread by saliva-blood contact; thus, a human bitten by a werewolf in wolf-form will become a werewolf themselves. However, if a human is bitten by a werewolf in human-form, the victim will only acquire some lupine tendencies. Werewolves seldom have children. It seems that werewolves, when in their animal state, pose the danger of biting the nearest human being, but not animals. Humans are the only species known to be capable of infection. Though they can live otherwise normal lives, on every full moon a werewolf will go through an incredibly painful transformation from a human into a wolf-like creature. They lose the ability to think in a human way, becoming highly aggressive towards humans- even those to whom they are close. Though werewolves usually only infect their victims through biting, they sometimes take it too far and kill their victims. Without any humans nearby to attack, or other animals to occupy it, the werewolf will attack itself out of frustration. Unfortunately, there is currently no cure for lycanthropy. However, some of the worst effects can be mitigated by consuming Wolfsbane Potion, which allows a werewolf to retain his or her human mind while transformed, thus freeing him or her from the worry of harming other humans or themselves. It is a difficult potion to make. Because werewolves only pose a danger to humans, companionship with animals whilst transformed has been known to make the experience more bearable as the werewolf has no-one to harm and will be less willing to harm him/herself. Contrary to what the Muggle world believes, werewolves are not affected by silver.