Anglers had been reporting black skin patches among catfish in Vermont lake. Now scientists have found it's a contagious cancer affecting 30% of their population

• Tasmanian devils, dogs and shellfish are some of the only animals that are known to carry naturally occurring cancers that can pass between individuals.
• But scientists in Vermont have discovered a new animal species that can do the same, catfish.
• Tasmanian devils bite each other's faces when mating or fighting and thus let tu